N-aryl[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide herbicides

ABSTRACT

Substituted N-aryl[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide compounds, such as N-(2,6-difluorophenyl)-5-methoxy-7-methyl[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide, N-(4-bromo-1-methyl-3-pyrazoly)-8-chloro-5-methoxy[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide, and N-(2-fluoro-4-methyl-3-pyridinyl)-8-ethoxy-6-chloro[1,2,4]triazolo[1,5-a]-pyridine-2-sulfonamide, were prepared by condensation of a 2-chlorosulfonyl[1,2,4]triazolo[1,5-a]pyridine compound with an aryl amine. The compounds prepared were found to possess excellent herbicidal activity on a broad spectrum of vegetation at low application rates.

CROSS-REFERENCE TO RELATED APPLICATION

This application is a Continuation-in-Part of application Ser. No. 08/273,519, filed Jul. 11, 1994 abandoned.

BACKGROUND OF THE INVENTION

The present invention relates to substituted sulfonamide compounds, to herbicidal compositions containing the compounds, and to the utility of the compounds for the control of unwanted vegetation.

The control of unwanted vegetation by means of chemical agents, i.e., herbicides, is an important aspect of modern agriculture and land management. While many chemicals that are useful for the control of unwanted vegetation are known, new compounds that are more effective generally, are more effective for specific plant species, are less damaging to desirable vegetation, are safer to man or the environment, are less expensive to use, or have other advantageous attributes are desirable.

A number of sulfonamide compounds, including certain substituted [1,2,4]triazolo[1,5-a]pyrimidine-2-sulfonamide compounds (U.S. Pat. No. 4,954,163), and [1,2,4]triazolo[1,5-c]pyrimidine-2-sulfonamide compounds (U.S. Pat. No. 5,010,195 and European Application 244,948) are known and are known to possess herbicidal activity, especially on broadleaf weeds.

SUMMARY OF THE INVENTION

It has now been found that certain N-aryl[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide compounds are potent herbicides for the control of unwanted vegetation, have desirable crop selectivity, and have favorable toxicological and environmental attributes.

The invention includes N-aryl[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide compounds of Formula I: ##STR1## wherein

W, X, Y, and Z each independently represents H, CH₃, CH₂ CH₃, CH₂ OCH₃, CF₃, F, Cl, Br, I, OCH₂ CF₃, S(C₁ -C₃)alkyl, or O(C₁ -C₃)alkyl optionally monosubstituted with F, Cl, or OCH₃, with the proviso that at least one of W, X, Y, and Z represents H;

V represents H, COR', CO₂ R", or CONR'"₂ ;

Ar represents an aromatic moiety one of the formulas: ##STR2##

A represents F, Cl, Br, CO₂ R", CONR'"₂, (C₁ -C₂ haloalkyl, NO₂, CN, SOR', or SO₂ R';

B represents H, CH₃, C₂ H₅, F, Cl, Br, CN, OR', SR', NR'"₂, phenyl, or phenoxy, each phenyl and phenoxy optionally possessing 1 to 3 substituents selected from the group consisting of F, Cl, Br, CN, CF₃, NO₂, and CH₃ ;

D and J each independently represents H or CH₃ with the proviso that at least one of D and J represents H;

A' and B' each independently represents H, R', OR', OCH₂ CH₂ Cl, OCH₂ CH₂ OCH₃, S(O)_(n) R', F, Cl, Br, I, CN, NO₂, C₆ H₅, CO₂ R", or CONR'"₂ with the proviso that not more than one of A' and B' represents H;

D' represents H, F, Cl, Br, I, CF₃, or CH₃ ;

A" represents F, Cl, Br, I, CF₃, SCF₃, CN, CO₂ R", or CONR'"₂ and is located in the 4-position when the point of attachment is the 3- or 5-position and represents F, Cl, Br, I, CF₃, or CH₃ and is located in the 3- or 5-position when the point of attachment is the 4-position;

B" represents H when the point of attachment is the 3- or 5-position and represents H, Cl, Br, F, CH₃, or OCH₃ and is located the 3- or 5-position not occupied by A" when the point of attachment is the 4-position;

T represents H or F;

n represents 0, 1, or 2;

R' represents (C₁ -C₄)alkyl optionally singly to completely substituted with fluorine;

R" represents (C₁ -C₄)alkyl, (C₃ -C₄)alkenyl, or (C₃ -C₄)alkynyl;

R'" represents H or (C₁ -C₄)alkyl; and when V represents H, the agriculturally acceptable salts thereof.

The compounds of the invention, usually in the form of an herbicidal composition containing one or more of them in admixture with an agriculturally acceptable adjuvant or carrier, exhibit strong herbicidal properties when applied either directly to the unwanted vegetation or to the locus thereof and when applied either preemergence or postemergence.

The invention includes certain intermediates that are useful in the preparation of the herbicidal compounds of the invention.

DETAILED DESCRIPTION OF THE INVENTION

The herbicidal compounds of the invention are N-aryl[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide compounds of Formula I: ##STR3## These compounds can be described as amides derived from substituted [1,2,4]triazolo[1,5-a]pyridine-2-sulfonic acid compounds and substituted aromatic amine compounds, such as anilines, aminopyridines, aminopyrazoles, and aminoindazoles.

The Chemical Abstracts nomenclature numbering system for [1,2,4]triazolo[1,5-a]pyridine ring compounds is as follows: ##STR4## Thus, the compounds of the invention are 2-sulfonamide compounds and the W substituents are in the 5-position, the X substituents are in the 6-position, the Y substituents are in the 7-position, and the Z substituents are in the 8-position.

The compounds of the invention include those of Formula I wherein up to three of W, X, Y, and Z independently represent CH₃, CH₂ CH₃, CH₂ OCH₃, CF₃, F, Cl, Br, I, OCH₂ CF₃, S(C₁ -C₃)alkyl, or O(C₁ -C₃)alkyl optionally monosubstituted with F, Cl, or OCH₃ and the remaining one to four of W, X, Y, and Z represent hydrogen. Compounds wherein two of W, X, Y, and Z represent hydrogen are usually preferred. Compounds wherein one or both of W and Z represents methoxy or wherein one of W and Z represents ethoxy or isopropoxy are, further, typically preferred. Those wherein W represents methoxy or ethoxy are typically more preferred. Compounds of Formula I wherein W represents methoxy, ethoxy, or isopropoxy, X and Z each represent hydrogen, and Y represents methyl or a halogen; or wherein W represents methoxy or ethoxy, X and Y each represent hydrogen, and Z represents methyl, methoxy, or a halogen; or wherein Z represents methoxy or ethoxy, W and Y each represent hydrogen, and X represents methyl, trifluoromethyl, or a halogen are often of special interest.

V represents hydrogen or an acyl derivative, such as CO(C₁ -C₄)alkyl optionally singly to completely substituted with fluorine, CO₂ (C₁ -C₄)alkyl, CO₂ (C₃ -C₄)alkenyl, CO₂ (C₃ -C₄)alkynyl, CON((C₁ -C₄)alkyl)₂, CONH(C₁ -C₄)alkyl, or CONH₂. Hydrogen is generally preferred. When V represents hydrogen, the invention includes the agriculturally acceptable salts obtained by neutralizing the resulting acid with a base.

The term Ar in Formula I represents an aromatic moiety, especially an aromatic moiety of one the following formulas: ##STR5## which includes phenyl moieties, 3-pyridinyl moieties, 1-methyl-(3-, 4-, or 5-)pyrazolyl moieties, and 1-methyl-3-indazolyl moieties.

When Ar represents a phenyl moiety, the moiety is substituted in at least one ortho position with an electron withdrawing group. Compounds of Formula I wherein Ar represents a substituted phenyl moiety include those wherein A represents F, Cl, Br, CO₂ R", CONR'"₂, (C₁ -C₂)haloalkyl, NO₂, CN, SOR', or SO₂ R'; B represents H, CH₃, C₂ H₅, F, Cl, Br, CN, OR', SR', NR'"₂, phenyl, or phenoxy, each phenyl and phenoxy optionally possessing 1 to 3 substituents selected from the group consisting of F, Cl, Br, CN, CF₃, NO₂, and CH₃ ; and D and J each independently represents H or CH₃ with the proviso that at least one of D and J represents H. Compounds wherein A represents F, Cl, Br, CF₃, NO₂, or CO₂ CH₃ ; B represents F, Cl, Br, OCH₃, or CH₃ ; J represents H; and D represents H or CH₃ are often preferred. Compounds wherein A and B both represent F or Cl and D and J both represent H, wherein A and B both represent F or Cl, D represents CH₃, and D represents H, wherein A represents CO₂ CH₃, B represents Cl or F, and D and J both represent H, and wherein A represents CF₃, B represents OCH₃, and D and J both represent H are often more preferred.

When Ar represents a 3-pyridinyl moiety, the moiety is substituted in at least one of the 2- and 4-positions. Compounds that are substituted in both of these positions are often preferred. Compounds of Formula I wherein Ar represents a substituted 3-pyridinyl moiety include those wherein A' and B' are selected from H, F, Cl, Br, I, CN, NO₂, C₆ H₅, CO₂ R", CONR'"₂, 2-chloroethoxy or 2-methoxyethoxy, or (C₁ -C₄)alkyl, (C₁ -C₄)alkoxy, (C₁ -C₄)alkylthio, (C₁ -C₄)alkylsulfinyl, or (C₁ -C₄)alkylsulfonyl each optionally singly to completely substituted with fluorine, and D' represents H, F, Cl, Br, I, CF₃, or CH₃. Compounds wherein A' represents CH₃, O(C₁ -C₃)alkyl, F, Cl, Br, or I; B' represents F, Cl, Br, I, CH₃, C₂ H₅, CF₃, O(C₁ -C₃)alkyl, OCH(CH₃)CF₃, OCH₂ CH₂ F, OCH₂ CHF₂ or CO₂ (C₁ -C₃)alkyl; and D' represents H are often preferred. Such compounds wherein A' represents Br, Cl, F, or OCH₃, B' represents CH₃, OCH₃, OC₂ H₅, OC₃ H₇ (n), OC₃ H₇ (i), OCH(CH₃)CF₃, or OCH₂ CH₂ F, and D' represents H; or wherein A' represents OCH₃ or OC₂ H₅, B' represents CO₂ (C₁ -C₂)alkyl, Br, Cl, or F, and D' represents H are typically more preferred. 3-Pyridinyl moieties wherein A' represents F, Cl, Br, or OCH₃, B' represents CH₃, OCH₃, OC₂ H₅, OC₃ H₇ (n), OC₃ H₇ (i), OCH(CH₃)CF₃, or OCH₂ CH₂ F, and D' represents H are sometimes especially preferred. 3-Pyridinyl moieties are often preferred Ar moieties.

When Ar represents a pyrazolyl moiety, the moiety is attached to the sulfonamide nitrogen atom at a 3-, 4-, or 5-position and has a methyl group in the 1-position. When the point of attachment is the 3- or 5-position, the moiety is substituted in the 4-position with an electron withdrawing group. The 3- or 5-position attachment compounds wherein the 4-position substituent A" represents F, Cl, Br, I, CF₃, SCF₃, CN, CO₂ R", and CONR'"₂ (B" represents H) are specifically identified. Those wherein A" represents Cl, Br, I, or CF₃ are usually more preferred. When the point of attachment is the 4-position, the moiety is substituted in one or both of the 3- and 5-positions. Such compounds wherein the 3- or 5-position substituent A" represents F, Cl, Br, I, CF₃, and CH₃ and the other 3- or 5-position substituent B" represents H, Cl, Br, F, CH₃, or OCH₃ are specifically identified. Pyrazolyl moieties wherein A" represents Cl, Br, I, or CF₃ and B" represents H are often preferred.

When Ar represents an indazolyl moiety, the moiety is attached to the sulfonamide nitrogen atom at the 3-position, has a methyl group in the 1-position, and is optionally mono-substituted with fluorine. Such compounds having a fluoro substituent in the 4-position are often preferred.

The term alkyl as used herein includes straight chain, branched chain, and cyclic moieties. Thus, typical alkyl groups are methyl, ethyl, 1-methylethyl, propyl, cyclopropyl and the like. Methyl and ethyl are often preferred. Typical alkyl groups singly to completely substituted with fluorine include trifluoromethyl, monofluoromethyl, 2,2,2-trifluoroethyl, 2,3-difluoropropyl, and the like; trifluoromethyl is often preferred. The term haloalkyl is used herein to denote alkyl singly to completely substituted with fluorine or chlorine and includes trifluoromethyl, dichloromethyl, 2,2-difluoro-2-chloroethyl, and the like; trifluoromethyl is often preferred. The term halogen includes fluorine, chlorine, bromine, and iodine.

The term "agriculturally acceptable salts" is employed herein to denote compounds wherein the acidic sulfonamide proton of the compound of Formula I is replaced by a cation which itself is neither herbicidal to crop plants being treated nor significantly deleterious to the applicator, the environment, or the ultimate user of any crop being treated. Suitable cations include, for example, those derived from alkali or alkaline earth metals and those derived from ammonia and amines. Preferred cations include sodium, potassium, magnesium, and aminium cations of the formula:

    R.sup.6 R.sup.7 R.sup.8 NH.sup.⊕

wherein R⁶, R⁷, and R⁸ each, independently represents hydrogen or (C₁ -C₁₂)alkyl, (C₃ -C₁₂)cycloalkyl, or (C₃ -C₁₂)alkenyl, each of which is optionally substituted by one or more hydroxy, (C₁ -C₈)alkoxy, (C₁ -C8)alkylthio or phenyl groups; provided that R⁶, R⁷, and R⁸ are sterically compatible. Additionally, any two of R⁶, R⁷, and R⁸ together may represent an aliphatic difunctional moiety containing 1 to 12 carbon atoms and up to two oxygen or sulfur atoms. Salts of the compounds of Formula I can be prepared by treatment of compounds of Formula I wherein V represents hydrogen with a metal hydroxide, such as sodium hydroxide, potassium hydroxide, or magnesium hydroxide, or an amine, such as ammonia, trimethylamine, hydroxyethylamine, bisallylamine, 2-butoxyethylamine, morpholine, cyclododecylamine, or benzylamine.

While each of the N-aryl[1,2,4]triazolo[1,5-a]-pyridine-2-sulfonamide compounds encompassed by Formula I is within the scope of the invention, the degree of herbicidal activity and the spectrum of weed control obtained varies depending upon the substituents present and, consequently, certain of the compounds are preferred. The compounds that are preferred in any specific situation further depends on the identity of the undesirable vegetation to be controlled, climatic factors, whether total or selective vegetation control is desired, and other factors.

A listing of some typical compounds of the invention is given in Table 1. Some of the specifically preferred compounds of the invention include: N-(2,6-dichloro-3-methylphenyl)-5-methoxy-7-methyl[1,2,4]triazolo[1, 5-a]pyridine-2-sulfonamide, N-(2,3-dimethyl-6-nitrophenyl)-5-methoxy-7-methyl[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide, N-(2-fluoro-4-methyl-3-pyridinyl)-5-methoxy-7-methyl[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide, N-(2-chloro-4-ethoxy-3-pyridinyl)-5-methoxy-7-methyl[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide, N-(2-chloro-4-methyl-3-pyridinyl)-5-methoxy-7-methyl[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide, N-(4-bromo-1-methyl-3-pyrazolyl)-5-methoxy-7-methyl[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide, N-(2-methyl-6-nitrophenyl)-5-ethoxy-7-methyl[1,2,4]triazolo[1, 5-a]pyridine-2-sulfonamide, N-(2-methoxy-6-(trifluoromethyl)phenyl)-5-ethoxy-7-methyl[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide, N-(2,6-difluorophenyl)-8-chloro-5-methoxy[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide, N-(2-fluoro-4-methyl-3-pyridinyl)-8-chloro-5-methoxy[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide, N-(2-fluoro-4-methyl-3-pyridinyl)-7-chloro-5-methoxy[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide, N-(4-bromo-1-methyl-3-pyrazolyl)-7-chloro-5-methoxy[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide, N-(2-fluoro-4-methyl-3-pyridinyl)-7-chloro-5-ethoxy[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide, N-(4-bromo-1-methyl-3-pyrazolyl)-8-methoxy[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide, N-(4-bromo-1-methyl-3-pyrazolyl)-6-chloro-8-methoxy[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide, N-(2,6-dichlorophenyl)-6-bromo-8-methoxy[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide, N-(2-fluoro-4-methyl-3-pyridinyl)-6-bromo-8-methoxy[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide, N-(2-methyl-6-nitrophenyl)-7-methyl-5-(2,2,2-trifluoroethoxy)[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide, N-(2-methyl-6-nitrophenyl)-5-chloro-7-methyl[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide, and N-(2-chloro-4-methoxy-3-pyridinyl)-5,7-dimethoxy[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide.

                                      TABLE 1                                      __________________________________________________________________________     N-ARYL[1,2,4]TRIAZOLO[1,5-A]PYRIDINE-2-SULFONAMIDE COMPOUNDS                    ##STR6##                                                                                                                 % C % H % N                         Cpd.                                  Melting                                                                             calc.                                                                              calc.                                                                              calc.                       No.                                                                               W     X  Y   Z     Ar         Form point °C.                                                                    found                                                                              found                                                                              found                       __________________________________________________________________________     1  H     H  H   H     2,6-dichlorophenyl                                                                        white                                                                               269-270                                                                             42.0                                                                               2.35                                                                               16.3                                                         powder    41.9                                                                               2.22                                                                               16.3                        2  H     H  H   H     2,6-difluorophenyl                                                                        white                                                                               222-223                                                                             45.6                                                                               2.60                                                                               18.1                                                         powder    45.6                                                                               2.56                                                                               18.2                        3  H     H  H   H     1-methyl-4-bromo-                                                                         tan  229-231                                                                             33.6                                                                               2.54                                                                               23.5                        3-pyrazolyl                                                                       solid    34.0                                                                               2.55  23.2                                                     4  H     H  CH.sub.3                                                                           H     2,6-dichlorophenyl                                                                        tan  232-234                                                                             43.7                                                                               2.82                                                                               15.7                                                         powder    44.0                                                                               2.87                                                                               15.5                        5  H     H  CH.sub.3                                                                           H     2,6-difluorophenyl                                                                        white                                                                               231-232                                                                             48.1                                                                               3.11                                                                               17.3                                                         powder    48.1                                                                               2.97                                                                               17.4                        6  H     H  CH.sub.3                                                                           H     1-methyl-4-bromo-                                                                         white                                                                               238-240                                                                             35.7                                                                               2.72                                                                               22.7                        3-pyrazolyl                                                                       solid    35.8                                                                               3.00  22.6                                                     7  Cl    H  CH.sub.3                                                                           H     2-fluoro-4-methyl-                                                                        yellow                                                                              253-255                                                                             44.0                                                                               2.84                                                                               19.7                        3-pyridinyl                                                                       powder                                                                               (d)                                                                               44.2                                                                               3.09  19.7                                                     8  OCH.sub.3                                                                            H  CH.sub.3                                                                           H     2-fluoro-4-methyl-                                                                        white                                                                               202-204                                                                             47.9                                                                               4.02                                                                               19.9                        3-pyridinyl                                                                       powder                                                                               (d)                                                                               48.0                                                                               4.06  19.6                                                     9  OCH.sub.2 CF.sub.3                                                                   H  CH.sub.3                                                                           H     2-fluoro-4-methyl-                                                                        white                                                                               249-250                                                                             43.0                                                                               3.12                                                                               16.7                        3-pyridinyl                                                                       powder                                                                               (d)                                                                               43.2                                                                               3.21  16.6                                                     10 Cl    H  CH.sub.3                                                                           H     1-methyl-4-bromo-                                                                         tan  262-264                                                                             32.6                                                                               2.48                                                                               20.7                        3-pyrazolyl                                                                       solid    30.7                                                                               2.59  20.7                                                     11 Cl    H  CH.sub.3                                                                           H     2,6-dibromophenyl                                                                         white                                                                               256-259                                                                             32.5                                                                               1.89                                                                               11.7                                                         powder    32.8                                                                               2.06                                                                               11.7                        12 Cl    H  CH.sub.3                                                                           H     2-methyl-6-methoxy-                                                                       white                                                                               198-202                                                                             48.7                                                                               3.83                                                                               4.2                                               carbonylphenyl                                                                            solid     48.6                                                                               4.20                                                                               14.0                        13 OCH.sub.2 CH.sub.3                                                                   H  CH.sub.3                                                                           H     2-fluoro-4-methyl-                                                                        white                                                                               206-208.5                                                                           49.3                                                                               4.41                                                                               19.2                        3-pyridinyl                                                                       powder   49.7                                                                               4.44  19.1                                                     14 Cl    H  CH.sub.3                                                                           H     2-fluoro-6-methoxy-                                                                       mauve                                                                               216-19                                                                              45.2                                                                               3.03                                                                               14.1                                              carbonylphenyl                                                                            powder    45.0                                                                               3.40                                                                               14.0                        15 Cl    H  CH.sub.3                                                                           H     1-methyl-3-indazolyl                                                                      tan  267-269                                                                             46.7                                                                               3.66                                                                               21.8                                                         solid     46.5                                                                               3.52                                                                               21.8                        16 CH.sub.3                                                                             H  CH.sub.3                                                                           H     1-methyl-4-bromo-                                                                         tan  229-232                                                                             37.4                                                                               3.40                                                                               21.8                        3-pyrazolyl                                                                       powder                                                                               (d)                                                                               38.1                                                                               3.62  21.6                                                     17 CH.sub.3                                                                             H  CH.sub.3                                                                           H     2,6-dichlorophenyl                                                                        white                                                                               250-252                                                                             45.3                                                                               3.26                                                                               15.1                                                         powder    44.9                                                                               3.49                                                                               14.8                        18 CH.sub.3                                                                             H  CH.sub.3                                                                           H     2,6-difluorophenyl                                                                        lt. tan                                                                             207-209                                                                             49.7                                                                               3.58                                                                               16.6                                                         powder    49.4                                                                               3.80                                                                               16.4                        19 OCH.sub.3                                                                            H  CH.sub.3                                                                           H     1-methyl-4-bromo-                                                                         white                                                                               251 (d)                                                                             35.9                                                                               3.27                                                                               20.9                        3-pyrazolyl                                                                       solid    36.0                                                                               3.05  20.9                                                     20 OCH.sub.3                                                                            H  CH.sub.3                                                                           H     2-bromo-6-chloro-                                                                         white                                                                               >265 39.0                                                                               2.80                                                                               13.0                                              phenyl     solid     37.9                                                                               2.75                                                                               12.5                        21 OCH.sub.2 CH.sub.3                                                                   H  CH.sub.3                                                                           H     2-bromo-6-chloro-                                                                         white                                                                               279  40.4                                                                               3.17                                                                               12.6                                              phenyl     solid     40.4                                                                               3.08                                                                               12.6                        22 Cl    H  CH.sub.3                                                                           H     2-bromo-6-fluoro-                                                                         tan  226  37.2                                                                               2.16                                                                               3.4                                               phenyl     solid     37.1                                                                               1.86                                                                               13.3                        23 OCH.sub.3                                                                            H  CH.sub.3                                                                           H     2-bromo-6-fluoro-                                                                         white                                                                               253 (d)                                                                             40.5                                                                               2.91                                                                               13.5                                              phenyl     solid     40.3                                                                               3.13                                                                               13.7                        24 OCH.sub.2 CH.sub.3                                                                   H  CH.sub.3                                                                           H     2-bromo-6-fluoro-                                                                         white                                                                               259 (d)                                                                             42.0                                                                               3.29                                                                               13.1                                              phenyl     solid     41.9                                                                               3.44                                                                               13.0                        25 Cl    H  CH.sub.3                                                                           H     2-methoxy-6-(tri-                                                                         white                                                                               231-232.5                                                                           42.8                                                                               2.87                                                                               13.3                                              fluoromethyl)phenyl                                                                       solid     42.9                                                                               3.00                                                                               13.5                        26 Cl    H  CH.sub.3                                                                           H     2,6-dichloro-3-                                                                           white                                                                               269-271                                                                             41.5                                                                               2.73                                                                               3.8                         methylphenyl                                                                      solid    41.5                                                                               2.92  14.0                                                     27 Cl    H  CH.sub.3                                                                           H     2,6-difluoro-3-                                                                           white                                                                               224-226                                                                             45.1                                                                               2.97                                                                               15.0                        methylhenyl                                                                       solid    45.1                                                                               2.62  15.2                                                     28 OCH.sub.3                                                                            H  CH.sub.3                                                                           H     2-methoxy-6-(tri-                                                                         white                                                                               243-245                                                                             46.2                                                                               3.63                                                                               13.5                                              fluoromethyl)phenyl                                                                       solid     46.1                                                                               3.58                                                                               13.4                        29 OCH.sub.3                                                                            H  CH.sub.3                                                                           H     1-methyl-3-indazolyl                                                                      tan solid                                                                           247-248                                                                             51.7                                                                               4.07                                                                               22.6                                                                   51.9                                                                               3.87                                                                               22.4                        30 OCH.sub.3                                                                            H  CH.sub.3                                                                           H     2-chloro-6-methoxy-                                                                       white                                                                               145-146                                                                             47.1                                                                               3.95                                                                               14.6                                              phenyl     solid     47.0                                                                               3.97                                                                               14.6                        31 OCH.sub.3                                                                            H  CH.sub.3                                                                           H     2,6-dichloro-3-                                                                           grey 150-151                                                                             44.9                                                                               3.52                                                                               14.0                        methylphenyl                                                                      powder   45.2                                                                               3.58  14.0                                                     32 OCH.sub.3                                                                            H  CH.sub.3                                                                           H     2,6-difluoro-3-                                                                           white                                                                               144-145                                                                             48.9                                                                               3.83                                                                               15.2                        methylphenyl                                                                      powder   48.9                                                                               3.78  15.3                                                     33 OCH.sub.2 CH.sub.3                                                                   H  CH.sub.3                                                                           H     2-chloro-6-methoxy-                                                                       grey 232-235                                                                             48.3                                                                               4.32                                                                               14.1                                              phenyl     powder    48.3                                                                               4.71                                                                               14.0                        34 OCH.sub.2 CH.sub.3                                                                   H  CH.sub.3                                                                           H     2-methoxy-6-(tri-                                                                         white                                                                               246-247                                                                             47.4                                                                               3.98                                                                               13.0                                              fluoromethyl)phenyl                                                                       powder    47.4                                                                               4.03                                                                               13.0                        35 OCH.sub.2 CH.sub.3                                                                   H  CH.sub.3                                                                           H     2,6-dichloro-3-                                                                           white                                                                               260-262                                                                             46.3                                                                               3.88                                                                               13.5                        methylphenyl                                                                      powder   46.2                                                                               3.69  13.4                                                     36 OCH.sub.2 CH.sub.3                                                                   H  CH.sub.3                                                                           H     2,6-difluoro-3-                                                                           white                                                                               240-243                                                                             50.3                                                                               4.22                                                                               14.7                        methylphenyl                                                                      powder   50.2                                                                               4.38  14.6                                                     37 OCH.sub.2 CH.sub.3                                                                   H  CH.sub.3                                                                           H     2-methyl-6-nitro-                                                                         white                                                                               256 (d)                                                                             49.1                                                                               4.38                                                                               17.9                                              phenyl     solid     49.1                                                                               4.42                                                                               18.1                        38 OCH.sub.2 CH.sub.3                                                                   H  CH.sub.3                                                                           H     2,3-dimethyl-6-nitro-                                                                     yellow                                                                              255-256                                                                             50.4                                                                               4.72                                                                               17.3                                              phenyl     solid                                                                               (d)  50.4                                                                               4.88                                                                               17.2                        39 OCH.sub.2 CH.sub.3                                                                   H  CH.sub.3                                                                           H     2-fluoro-5-methyl-                                                                        white                                                                               238-239                                                                             52.7                                                                               4.70                                                                               15.4                                              phenyl     crystals                                                                            (d)  52.5                                                                               4.62                                                                               15.5                        40 OCH.sub.2 CH.sub.3                                                                   H  CH.sub.3                                                                           H     2-chloro-6-methyl-                                                                        white                                                                               253-255                                                                             50.5                                                                               4.50                                                                               14.7                                              phenyl     solid                                                                               (d)  50.5                                                                               4.58                                                                               14.9                        41 OCH.sub.2 CH.sub.3                                                                   H  CH.sub.3                                                                           H     2-(trifluoromethyl)-                                                                      white                                                                               203-204.5                                                                           48.0                                                                               3.78                                                                               13.8                                              phenyl     solid     47.9                                                                               3.96                                                                               13.9                        42 OCH.sub.3                                                                            H  CH.sub.3                                                                           H     2-methyl-6-nitro-                                                                         yellow                                                                              231-233                                                                             47.7                                                                               4.01                                                                               18.6                                              phenyl     powder    48.1                                                                               4.29                                                                               18.6                        43 OCH.sub.3                                                                            H  CH.sub.3                                                                           H     2,3-dimethyl-6-nitro-                                                                     yellow                                                                              258-260                                                                             49.1                                                                               4.38                                                                               17.9                                              phenyl     powder    49.2                                                                               4.60                                                                               18.0                        44 OCH.sub.3                                                                            H  CH.sub.3                                                                           H     2-fluoro-5-methyl-                                                                        white                                                                               229-230                                                                             51.4                                                                               4.32                                                                               16.0                                              phenyl     solid     51.7                                                                               4.56                                                                               16.2                        45 OCH.sub.3                                                                            H  CH.sub.3                                                                           H     2-(trifluoromethyl)-                                                                      white                                                                               230-231                                                                             46.6                                                                               3.39                                                                               14.5                                              phenyl     powder    46.4                                                                               3.52                                                                               14.6                        46 Cl    H  CH.sub.3                                                                           H     2-fluoro-5-methyl-                                                                        white                                                                               213-214                                                                             47.4                                                                               3.41                                                                               15.8                                              phenyl     solid     47.5                                                                               3.44                                                                               15.8                        47 OCH.sub.3                                                                            H  CH.sub.3                                                                           H     2-chloro-6-methyl-                                                                        white                                                                               253-255                                                                             49.1                                                                               4.12                                                                               15.3                                              phenyl     solid     49.3                                                                               4.24                                                                               15.3                        48 OCH.sub.2 CF.sub.3                                                                   H  CH.sub.3                                                                           H     2-methyl-6-nitro-                                                                         white                                                                               245-247                                                                             43.2                                                                               3.17                                                                               15.7                                              phenyl     solid                                                                               (d)  43.3                                                                               3.44                                                                               15.7                        49 OCH.sub.2 CF.sub.3                                                                   H  CH.sub.3                                                                           H     2,3-dimethyl-6-nitro-                                                                     yellow                                                                              242-243                                                                             44.5                                                                               3.51                                                                               15.2                                              phenyl          (d)  44.4                                                                               3.72                                                                               15.1                        50 OCH.sub.2 CF.sub.3                                                                   H  CH.sub.3                                                                           H     2-chloro-6-methyl-                                                                        white                                                                               215-217                                                                             44.2                                                                               3.25                                                                               12.9                                              phenyl     solid     44.0                                                                               3.49                                                                               12.8                        51 OCH.sub.3                                                                            H  CH.sub.3                                                                           H     2-chloro-4-methyl-3-                                                                      tan  209-210                                                                             45.7                                                                               3.84                                                                               19.0                        pryridinyl                                                                        powder                                                                               (d)                                                                               46.0                                                                               4.07  18.7                                                     52 Cl    H  CH.sub.3                                                                           H     2-chloro-4-methoxy-3-                                                                     yellow                                                                              219-221                                                                             40.2                                                                               2.86                                                                               18.0                        pyridinyl                                                                         powder                                                                               (d)                                                                               40.6                                                                               3.08  18.0                                                     53 OCH.sub.3                                                                            H  CH.sub.3                                                                           H     2-chloro-4-methoxy-3-                                                                     white                                                                               216-217                                                                             43.8                                                                               3.68                                                                               18.3                        pyridinyl                                                                         powder                                                                               (d)                                                                               43.8                                                                               3.55  17.9                                                     54 Cl    H  CH.sub.3                                                                           H     2-chloro-4-methyl-3-                                                                      white                                                                               255-257                                                                             42.0                                                                               2.98                                                                               18.8                        pyridinyl                                                                         powder                                                                               (d)                                                                               42.3                                                                               2.92  19.0                                                     55 OCH.sub.2 CF.sub.3                                                                   H  CH.sub.3                                                                           H     2-chloro-6-iodophenyl                                                                     white                                                                               248  33.0                                                                               2.03                                                                               10.3                                                         powder    32.9                                                                               1.94                                                                               10.1                        56 OCH.sub.2 CF.sub.3                                                                   H  CH.sub.3                                                                           H     2-floro-6-methoxy-                                                                        tan solid                                                                           182  44.2                                                                               3.06                                                                               12.1                                              carbonylpheny        44.1                                                                               2.88                                                                               12.0                        57 OCH.sub.2 CH.sub.3                                                                   H  CH.sub.3                                                                           H     2-fluoro-6-ethoxy-                                                                        tan solid                                                                           212  50.0                                                                               4.20                                                                               13.7                                              carbonylphenyl       51.0                                                                               4.46                                                                               13.3                        58 OCH.sub.2 CH.sub.3                                                                   H  CH.sub.3                                                                           H     2,6-dichlorophenyl                                                                        off-white                                                                           >275 44.9                                                                               3.52                                                                               14.0                                                         solid     42.6                                                                               3.55                                                                               13.3                        59 OCH.sub.2 CF.sub.3                                                                   H  CH.sub.3                                                                           H     2,6-dibromophenyl                                                                         white                                                                               262  33.1                                                                               2.04                                                                               10.3                                                         powder    33.0                                                                               1.89                                                                               10.2                        60 OCH.sub.2 CF.sub.3                                                                   H  CH.sub.3                                                                           H     2,6-dichlorophenyl                                                                        white     39.6                                                                               2.44                                                                               12.3                                                         powder    39.8                                                                               2.34                                                                               12.3                        61 OCH.sub.2 CH.sub.3                                                                   H  CH.sub.3                                                                           H     2,6-difluorophenyl                                                                        tan  254-256                                                                             48.9                                                                               3.83                                                                               15.2                                                         powder    48.7                                                                               4.03                                                                               15.2                        62 OCH.sub.2 CF.sub.3                                                                   H  CH.sub.3                                                                           H     2,6-fluorophenyl                                                                          white                                                                               267-269                                                                             42.7                                                                               2.63                                                                               13.3                                                         powder    39.5                                                                               2.57                                                                               12.3                        63 OCH.sub.2 CF.sub.3                                                                   H  CH.sub.3                                                                           H     2-methoxy-6-(tri-                                                                         off-white                                                                           235-237                                                                             42.2                                                                               2.91                                                                               11.5                                              fluoromethyl)phenyl                                                                       powder                                                                              (d)  42.2                                                                               2.80                                                                               11.6                        64 OCH.sub.2 CF.sub.3                                                                   H  CH.sub.3                                                                           H     4-bromo-1-methyl-5-                                                                       tan solid                                                                           193-197                                                                             33.3                                                                               2.58                                                                               17.9                        pyrazolyl   33.7                                                                               2.54  18.1                                                     65 Cl    H  Cl  H     2,6-dichlorophenyl                                                                        lt. tan                                                                             246-248                                                                             35.0                                                                               1.47                                                                               13.6                                                         powder    34.8                                                                               1.25                                                                               13.5                        66 OCH.sub.3                                                                            H  Cl  H     2,6-dichlorophenyl                                                                        lt. tan                                                                             232-243                                                                             38.3                                                                               2.22                                                                               13.7                                                         powder                                                                              (d)  38.3                                                                               2.12                                                                               13.7                        67 OCH.sub.2 CH.sub.3                                                                   H  CH.sub.3                                                                           H     2-chloro-6-fluoro-                                                                        white                                                                               >265 46.8                                                                               3.67                                                                               14.6                                              phenyl     solid     47.0                                                                               3.79                                                                               14.5                        68 Cl    H  CH.sub.3                                                                           H     2-bromo-6-chloro-                                                                         white                                                                               185-186                                                                             35.8                                                                               2.08                                                                               12.9                                              phenyl     solid     35.7                                                                               2.15                                                                               12.7                        69 OCH.sub.3                                                                            H  CH.sub.3                                                                           H     2-chloro-6-fluoro-                                                                        off-white                                                                           245  45.4                                                                               3.26                                                                               15.1                                              phenyl     solid     45.5                                                                               3.42                                                                               14.9                        70 OCH.sub.2 CF.sub.3                                                                   H  CH.sub.3                                                                           H     2-bromo-6-fluoro                                                                          white                                                                               >300 37.3                                                                               2.29                                                                               6.64                                              phenyl     powder    37.4                                                                               2.15                                                                               6.75                        71 OCH.sub.2 CF.sub.3                                                                   H  CH.sub.3                                                                           H     2-chloro-6-fluoro-                                                                        white                                                                               248  41.1                                                                               2.53                                                                               12.8                                              phenyl     solid     41.0                                                                               2.46                                                                               12.8                        72 OCH.sub.2 CH.sub.3                                                                   H  CH.sub.3                                                                           H     2-chloro-6-iodophenyl                                                                     white                                                                               >263 36.6                                                                               2.86                                                                               11.4                                                         powder    36.7                                                                               2.58                                                                               11.4                        73 OCH.sub.3                                                                            H  CH.sub.3                                                                           H     2-chloro-6-iodophenyl                                                                     white                                                                               >247 35.1                                                                               2.53                                                                               11.7                                                         powder    35.4                                                                               2.23                                                                               11.5                        74 Cl    H  CH.sub.3                                                                           H     2-methyl-6-nitro-                                                                         yellow                                                                              256-258                                                                             44.0                                                                               3.17                                                                               18.3                                              phenyl     powder    44.1                                                                               3.23                                                                               18.6                        75 Cl    H  CH.sub.3                                                                           H     2,3-dimethyl-6-nitro-                                                                     yellow                                                                              281-283                                                                             45.5                                                                               3.57                                                                               17.7                                              phenyl     solid     45.7                                                                               3.73                                                                               17.7                        76 Cl    H  CH.sub.3                                                                           H     2-chloro-6-methyl-                                                                        white                                                                               258-260                                                                             45.3                                                                               3.26                                                                               15.1                                              phenyl     solid     45.2                                                                               3.21                                                                               15.1                        77 Cl    H  CH.sub.3                                                                           H     2-(trifluoromethyl)-                                                                      white                                                                               196-198                                                                             43.0                                                                               2.58                                                                               14.3                                              phenyl     solid     42.9                                                                               2.72                                                                               14.5                        78 Cl    H  CH.sub.3                                                                           H     2,6-dichlorophenyl                                                                        white                                                                               257-258                                                                             39.9                                                                               2.32                                                                               14.3                                                         powder                                                                              (d)  39.8                                                                               2.35                                                                               14.3                        79 Cl    H  CH.sub.3                                                                           H     2,6-difluorophenyl                                                                        yellow                                                                              213-214                                                                             43.5                                                                               2.53                                                                               15.6                                                         powder    43.5                                                                               2.51                                                                               15.7                        80 OCH.sub.3                                                                            H  CH.sub.3                                                                           H     2,6-dichlorophenyl                                                                        white                                                                               269-270                                                                             43.4                                                                               3.13                                                                               14.5                                                         powder                                                                              (d)  43.3                                                                               3.13                                                                               14.4                        81 OCH.sub.3                                                                            H  CH.sub.3                                                                           H     2,6-difluorophenyl                                                                        tan  248-249                                                                             47.5                                                                               3.41                                                                               15.8                                                         powder                                                                              (d)  47.4                                                                               3.48                                                                               15.8                        82 OCH.sub.3                                                                            H  CH.sub.3                                                                           H     2-fluoro-6-methoxy-                                                                       mauve                                                                               220-221                                                                             48.7                                                                               3.83                                                                               14.2                                              carbonylphenyl                                                                            solid                                                                               (d)  48.9                                                                               3.82                                                                               14.2                        83 OCH.sub.3                                                                            H  CH.sub.3                                                                           H     2,6-dibromophenyl                                                                         white                                                                               270 (d)                                                                             35.3                                                                               2.54                                                                               11.8                                                         solid     35.5                                                                               2.72                                                                               11.8                        84 OCH.sub.2 CH.sub.3                                                                   H  CH.sub.3                                                                           H     2,6-dibromophenyl                                                                         white                                                                               271 (d)                                                                             36.8                                                                               2.88                                                                               11.4                                                         powder    37.8                                                                               3.17                                                                               11.5                        85 OCH.sub.3                                                                            H  CH.sub.3                                                                           H     2-methyl-6-methoxy-                                                                       off-white                                                                           212-214                                                                             52.3                                                                               4.65                                                                               14.4                                              carbonylphenyl                                                                            solid     52.4                                                                               4.82                                                                               14.2                        86 OCH.sub.3                                                                            H  CH.sub.3                                                                           H     4-bromo-1-methyl-3-                                                                       tan solid                                                                           263-264                                                                             35.9                                                                               3.27                                                                               21.0                        pyrazolyl   36.0                                                                               3.59  20.8                                                     87 Cl    H  CH.sub.3                                                                           H     2-chloro-6-methoxy-                                                                       cream                                                                               240-243                                                                             43.4                                                                               3.12                                                                               14.5                                              phenyl     solid     43.6                                                                               3.38                                                                               14.7                        88 OCH.sub.3                                                                            H  OCH.sub.3                                                                          H     2,6-dichlorophenyl                                                                        yellow                                                                              252-253                                                                             41.7                                                                               3.00                                                                               13.9                                                         powder                                                                              (d)  41.8                                                                               2.67                                                                               13.6                        89 H     CH.sub.3                                                                          H   Br    2,6-dichlorophenyl                                                                        off-white                                                                           240-242                                                                             35.8                                                                               2.08                                                                               12.9                                                         solid                                                                               (d)  35.5                                                                               1.88                                                                               13.2                        90 H     CH.sub.3                                                                          H   OCH.sub.3                                                                            2,6-dichlorophenyl                                                                        tan solid                                                                           232  43.4                                                                               3.12                                                                               14.5                                                                   42.3                                                                               3.51                                                                               14.0                        91 OCH.sub.3                                                                            H  CH.sub.3                                                                           H     2-bromo-6-methoxy-                                                                        off-white                                                                           225  42.2                                                                               3.32                                                                               12.3                                              carbonylphenyl                                                                            solid     42.0                                                                               3.05                                                                               12.5                        92 H     CH.sub.3                                                                          H   Br    2-fluoro-6-methoxy-                                                                       pink 198 (d)                                                                             40.6                                                                               2.73                                                                               12.6                                              carbonylphenyl                                                                            solid     40.4                                                                               2.53                                                                               12.6                        93 Cl    H  CH.sub.3                                                                           H     2-fluoro-5-methyl-3-                                                                      white                                                                               208-209                                                                             43.9                                                                               3.12                                                                               19.7                        pyridinyl                                                                         powder   43.9                                                                               3.41  19.7                                                     94 OCH.sub.3                                                                            H  CH.sub.3                                                                           H     2-fluoro-5-methyl-3-                                                                      white                                                                               237-238                                                                             47.9                                                                               4.02                                                                               19.9                        pyridinyl                                                                         powder                                                                               (d)                                                                               47.6                                                                               3.84  19.9                                                     95 H     Br H   Br    2,6-dichlorophenyl                                                                        brown                                                                          powder                                        96 H     Br H   OCH.sub.3                                                                            2,6-dichlorophenyl                                                                        tan  >300 34.5                                                                               2.01                                                                               12.4                                                         powder    35.5                                                                               2.14                                                                               12.0                        97 H     H  H   OCH.sub.3                                                                            2,6-dichlorophenyl                                                                        white                                                                               119-121                                                                             41.8                                                                               2.70                                                                               15.0                                                         powder    41.5                                                                               2.42                                                                               13.9                        98 OCH.sub.3                                                                            H  Cl  H     2-fluoro-6-methoxy-                                                                       white                                                                               221-222                                                                             43.5                                                                               2.92                                                                               13.5                                              carbonylphenyl                                                                            powder    43.1                                                                               2.90                                                                               13.5                        99 Cl    H  CH.sub.3                                                                           H     4-iodo-1-methyl-3-                                                                        tan solid                                                                           249-251                                                                             29.2                                                                               2.23                                                                               18.6                        pyrazolyl   29.0                                                                               2.16  18.4                                                     100                                                                               Cl    H  Cl  H     2-fluoro-6-methoxy-                                                                       lt. tan                                                                             182-183                                                                             40.1                                                                               2.16                                                                               13.4                                              carbonylphenyl                                                                            powder    39.9                                                                               2.05                                                                               13.1                        101                                                                               OCH.sub.3                                                                            H  CH.sub.3                                                                           H     4-iodo-1-methyl-3-                                                                        white                                                                               199 (d)                                                                             30.5                                                                               2.72                                                                               17.7                        pyrazolyl                                                                         solid    30.9                                                                               3.24  18.0                                                     102                                                                               Cl    H  Cl  H     2-fluoro-4-methyl-3-                                                                      lt. tan                                                                             221-223                                                                             38.3                                                                               2.14                                                                               18.6                        pyridinyl                                                                         powder   38.4                                                                               2.29  18.6                                                     103                                                                               OCH.sub.3                                                                            H  Cl  H     2-fluoro-4-methyl-3-                                                                      lt. tan                                                                             213-214                                                                             42.0                                                                               2.98                                                                               18.8                        pyridinyl                                                                         powder                                                                               (d)                                                                               42.3                                                                               2.70  18.7                                                     104                                                                               OCH.sub.2 CH.sub.3                                                                   H  Cl  H     2-fluoro-4-methyl-3-                                                                      lt. tan                                                                             184-185                                                                             43.6                                                                               3.40                                                                               18.2                        pyridinyl                                                                         powder                                                                               (d)                                                                               44.0                                                                               3.57  17.8                                                     105                                                                               Cl    H  Cl  H     4-bromo-1-methyl-3-                                                                       lt. tan                                                                             266-267                                                                             28.2                                                                               1.66                                                                               19.7                        pyrazolyl                                                                         powder                                                                               (d)                                                                               28.0                                                                               1.35  19.5                                                     106                                                                               OCH.sub.3                                                                            H  Cl  H     4-bromo-1-methyl-3-                                                                       white                                                                               257-258                                                                             31.3                                                                               2.39                                                                               19.9                        pyrazolyl                                                                         powder                                                                               (d)                                                                               31.3                                                                               2.06  19.9                                                     107                                                                               Cl    H  Cl  H     2,6-difluorophenyl                                                                        white                                                                               214-215                                                                             38.1                                                                               1.59                                                                               14.8                                                         powder    38.2                                                                               1.56                                                                               14.9                        108                                                                               OCH.sub.3                                                                            H  Cl  H     2,6-difluorophenyl                                                                        white                                                                               240-241                                                                             41.7                                                                               2.42                                                                               15.0                                                         powder                                                                              (d)  41.4                                                                               2.35                                                                               14.8                        109                                                                               Cl    Br H   OCH.sub.3                                                                            2,6-difluorophenyl                                                                        pale pink                                                                           262  34.4                                                                               1.78                                                                               12.4                                                         powder    34.7                                                                               1.64                                                                               12.1                        110                                                                               H     Br H   OCH.sub.3                                                                            4-bromo-1-methyl-3-                                                                       brown                                                                               >300 28.3                                                                               2.16                                                                               18.0                        pyrazolyl                                                                         powder   32.9                                                                               2.15  15.5                                                     111                                                                               H     Br H   OCH.sub.3                                                                            2-fluoro-4-methyl-3-                                                                      pink 198-200                                                                             37.5                                                                               2.66                                                                               16.8                        pyridinyl                                                                         powder   37.4                                                                               2.36  15.3                                                     112                                                                               H     H  Cl  H     2,6-difluorophenyl                                                                        white                                                                               276-278                                                                             41.8                                                                               2.05                                                                               16.3                                                         powder                                                                              (d)  41.7                                                                               2.30                                                                               16.3                        113                                                                               H     H  Cl  H     2-fluoro-6-methoxy-                                                                       white                                                                               205-207                                                                             43.8                                                                               2.62                                                                               14.6                                              carbonylphenyl                                                                            powder    43.7                                                                               2.74                                                                               14.7                        114                                                                               H     H  OCH.sub.3                                                                          H     2,6-difluorophenyl                                                                        white                                                                               231-232                                                                             45.9                                                                               2.96                                                                               16.4                                                         powder    45.6                                                                               2.97                                                                               16.4                        115                                                                               H     Cl H   OCH.sub.3                                                                            2,6-difluorophenyl                                                                        tan solid                                                                           223-225                                                                             41.7                                                                               2.42                                                                               15.0                                                              (d)  41.9                                                                               2.36                                                                               14.7                        116                                                                               H     Cl H   OCH.sub.3                                                                            2-fluoro-4-methyl-3-                                                                      cream                                                                               211  42.0                                                                               2.98                                                                               18.8                        pyridinyl                                                                         solid    41.4                                                                               2.74  17.8                                                     117                                                                               H     Cl H   OCH.sub.3                                                                            4-bromo-1-methyl-3-                                                                       rust 225  31.3                                                                               2.39                                                                               19.9                        pyrazolyl                                                                         solid    31.4                                                                               2.07  17.5                                                     118                                                                               OCH.sub.3                                                                            Br H   OCH.sub.3                                                                            2,6-difluorophenyl                                                                        purple                                                                              222-223                                                                             37.4                                                                               2.37                                                                               12.5                                                         solid     38.9                                                                               1.83                                                                               12.8                        119                                                                               Cl    H  CH.sub.3                                                                           H     5-chloro-2-fluoro-3-                                                                      grey 225-226                                                                             38.3                                                                               2.14                                                                               18.6                        pyridinyl                                                                         powder                                                                               (d)                                                                               38.8                                                                               1.94  18.3                                                     120                                                                               OCH.sub.3                                                                            H  CH.sub.3                                                                           H     5-chloro-2-fluoro-3-                                                                      white                                                                               262-264                                                                             42.0                                                                               2.98                                                                               18.8                        pyridinyl                                                                         powder   41.9                                                                               2.93  18.8                                                     121                                                                               OCH.sub.3                                                                            H  CH.sub.3                                                                           H     1-methyl-4-(tri-                                                                          white                                                                               191-193                                                                             37.0                                                                               3.10                                                                               19.9                                              fluoromethylthio)-3-                                                                      solid     37.3                                                                               2.91                                                                               19.8                        pyrazolyl                                                                      122                                                                               Cl    H  CH.sub.3                                                                           H     2-methoxy-6-methoxy-                                                                      purple                                                                              213-216                                                                             46.8                                                                               3.68                                                                               13.6                                              carbonylphenyl                                                                            powder    47.0                                                                               3.92                                                                               13.7                        123                                                                               OCH.sub.3                                                                            H  CH.sub.3                                                                           H     2-methoxy-6-methoxy-                                                                      tan  219-221                                                                             50.2                                                                               4.46                                                                               13.8                                              carbonylphenyl                                                                            powder    50.0                                                                               4.67                                                                               13.7                        124                                                                               Cl    H  CH.sub.3                                                                           H     4-methyl-3-pyridinyl                                                                      white                                                                               223-224                                                                             46.2                                                                               3.58                                                                               20.7                                                         powder                                                                              (d)  46.1                                                                               3.89                                                                               20.6                        125                                                                               OCH.sub.3                                                                            H  CH.sub.3                                                                           H     4-methyl-3-pyridinyl                                                                      lt. grey                                                                            209-210                                                                             50.4                                                                               4.54                                                                               21.0                                                         powder                                                                              (d)  49.3                                                                               4.95                                                                               19.8                        126                                                                               H     CF.sub.3                                                                          H   OCH.sub.3                                                                            2,6-difluorophenyl                                                                        off-white                                                                           172-173                                                                             41.2                                                                               2.22                                                                               13.7                                                         solid                                                                               (d)  41.6                                                                               2.26                                                                               13.6                        127                                                                               H     CF.sub.3                                                                          H   OCH.sub.3                                                                            2-fluoro-4-methyl-3-                                                                      off-white                                                                           238 (d)                                                                             41.5                                                                               2.74                                                                               17.3                        pyridinyl                                                                         solid    41.6                                                                               2.67  17.1                                                     128                                                                               H     CF.sub.3                                                                          H   OCH.sub.3                                                                            4-bromo-1-methyl-3-                                                                       orange                                                                              198  31.7                                                                               2.22                                                                               18.5                        pyrazolyl                                                                         solid    32.4                                                                               2.16  18.1                                                     129                                                                               OCH.sub.3                                                                            H  CH.sub.3                                                                           H     4-iodo-1-methyl-3-                                                                        tan solid                                                                           201-203                                                                             36.2                                                                               2.92                                                                               18.8                        pyrazolyl   36.0                                                                               2.74  19.0                                                     130                                                                               OCH.sub.2 CH.sub.3                                                                   H  CH.sub.3                                                                           H     4-bromo-1-methyl-3-                                                                       tan  245-247                                                                             37.6                                                                               3.64                                                                               20.2                        pyrazolyl                                                                         powder   37.8                                                                               3.75  19.9                                                     131                                                                               Cl    H  H   H     2,6-difluorophenyl                                                                        tan  255-256                                                                             41.8                                                                               2.05                                                                               16.3                                                         powder                                                                              (d)  41.8                                                                               2.00                                                                               16.4                        132                                                                               OCH.sub.3                                                                            H  H   H     2,6-difluorophenyl                                                                        tan  255-256                                                                             45.9                                                                               2.96                                                                               16.5                                                         powder                                                                              (d)  46.1                                                                               2.92                                                                               16.6                        133                                                                               OCH.sub.2 CH.sub.3                                                                   H  H   H     2,6-difluorophenyl                                                                        tan  263-264                                                                             47.5                                                                               3.42                                                                               15.8                                                         powder                                                                              (d)  47.6                                                                               3.04                                                                               16.0                        134                                                                               OCH.sub.2 --                                                                         H  CH.sub.3                                                                           H     2,6-difluorophenyl                                                                        tan  217-220                                                                             48.0                                                                               3.89                                                                               14.0                           CH.sub.2 OCH.sub.3            powder    48.2                                                                               4.05                                                                               14.1                        135                                                                               OCH.sub.2 --                                                                         H  CH.sub.3                                                                           H     2,6-difluorophenyl                                                                        tan  245-247                                                                             46.6                                                                               3.39                                                                               14.5                           CH.sub.2 F                    powder    46.9                                                                               3.43                                                                               14.5                        136                                                                               OCH.sub.2 CH.sub.3                                                                   H  H   H     2-fluoro-4-methyl-3-                                                                      lt. tan                                                                             196-197                                                                             47.9                                                                               4.02                                                                               15.8                        pyridinyl                                                                         powder                                                                               (d)                                                                               48.0                                                                               4.27  16.0                                                     137                                                                               Br    H  H   H     4-bromo-1-methyl-3-                                                                       tan  246-247                                                                             27.5                                                                               1.85                                                                               19.3                        pyrazolyl                                                                         powder                                                                               (d)                                                                               27.8                                                                               1.69  19.0                                                     138                                                                               OCH.sub.3                                                                            H  H   H     4-bromo-1-methyl-3-                                                                       tan  233-234                                                                             34.1                                                                               2.86                                                                               21.7                        pyrazolyl                                                                         powder                                                                               (d)                                                                               34.2                                                                               3.03  21.6                                                     139                                                                               OCH.sub.2 CH.sub.3                                                                   H  H   H     4-bromo-1-methyl-3-                                                                       tan  230-231                                                                             35.9                                                                               3.27                                                                               21.0                        pyrazolyl                                                                         powder                                                                               (d)                                                                               36.1                                                                               3.58  21.0                                                     140                                                                               OCH.sub.3                                                                            H  H   H     2-fluoro-4-methyl-3-                                                                      lt. tan                                                                             226-227                                                                             46.3                                                                               3.59                                                                               20.8                        pyridinyl                                                                         powder                                                                               (d)                                                                               46.2                                                                               3.90  20.7                                                     141                                                                               Br    H  H   H     2-fluoro-4-methyl-3-                                                                      brown                                                                               233-234                                                                             37.3                                                                               2.35                                                                               18.1                        pyridinyl                                                                         powder                                                                               (d)                                                                               37.3                                                                               2.66  18.4                                                     142                                                                               H     CF.sub.3                                                                          H   F     4-bromo-1-methyl-3-                                                                       orange                                                                              224-227                                                                             29.8                                                                               1.59                                                                               7.23                        pyrazolyl                                                                         solid (d)                                                                               30.8                                                                               1.11  6.62                                                     143                                                                               H     CF.sub.3                                                                          H   F     2,6-difluorophenyl                                                                        yellow                                                                              136-137                                                                             39.4                                                                               1.53                                                                               14.1                                                         solid     39.5                                                                               1.20                                                                               13.9                        144                                                                               H     CF.sub.3                                                                          H   F     4-methyl-3-pyridinyl                                                                      tan  172-173                                                                             39.7                                                                               2.05                                                                               17.8                                                         powder    40.1                                                                               1.94                                                                               17.8                        145                                                                               H     Cl H   OCH.sub.3                                                                            2-bromo-6-methoxy-                                                                        brown                                                                               173-175                                                                             37.9                                                                               2.54                                                                               11.8                                              carbonylphenyl                                                                            powder                                                                              (d)  38.0                                                                               2.35                                                                               11.8                        146                                                                               H     Cl H   OCH.sub.3                                                                            2-chloro-4-methyl-3-                                                                      brown                                                                               175-176                                                                             40.2                                                                               2.86                                                                               18.0                        pyridinyl                                                                         powder                                                                               (d)                                                                               40.0                                                                               2.73  16.2                                                     147                                                                               H     Cl H   OCH.sub.3                                                                            2-chloro-4-methoxy-3-                                                                     brown                                                                               175-178                                                                             38.6                                                                               2.74                                                                               17.3                        pyridinyl                                                                         powder                                                                               (d)                                                                               38.7                                                                               2.44  16.4                                                     148                                                                               OCH.sub.3                                                                            H  CH.sub.3                                                                           H     4-methoxycarbonyl-3-                                                                      tan solid                                                                           181-183                                                                             47.7                                                                               4.01                                                                               18.6                        pyridinyl                                                                               (d)                                                                               47.8                                                                               4.20  18.6                                                     149                                                                               Cl    H  CH.sub.3                                                                           H     4-methoxycarbonyl-3-                                                                      tan solid                                                                           168-170                                                                             44.0                                                                               3.17                                                                               18.3                        pyridinyl   43.8                                                                               3.28  18.3                                                     150                                                                               OCH.sub.3                                                                            H  CH.sub.3                                                                           H     4-carboxy-3-pyridinyl                                                                     white                                                                               254-256                                                                             46.3                                                                               3.61                                                                               19.3                                                         solid                                                                               (d)  46.0                                                                               3.31                                                                               19.0                        151                                                                               OCH.sub.3                                                                            H  CH.sub.3                                                                           H     4-fluoro-1-methyl-3-                                                                      tan solid                                                                           147-149                                                                             49.2                                                                               3.87                                                                               21.5                        indazolyl                                                                               (d)                                                                               49.1                                                                               4.12  21.4                                                     152                                                                               OCH.sub.2 --                                                                         H  CH.sub.3                                                                           H     2,6-difluorophenyl                                                                        tan  135-145                                                                             46.9                                                                               3.67                                                                               14.6                           CH.sub.2 Cl                   powder    44.4                                                                               3.00                                                                               13.7                        153                                                                               OC.sub.3 H.sub.7 (n)                                                                 H  CH.sub.3                                                                           H     2,6-difluorophenyl                                                                        tan  242-245                                                                             50.3                                                                               4.22                                                                               14.7                                                         powder    50.3                                                                               4.35                                                                               14.5                        154                                                                               H     Cl H   OCH.sub.3                                                                            4-iodo-1-methyl-3-                                                                        brown                                                                               195-200                                                                             28.2                                                                               2.15                                                                               17.9                        pyrazolyl                                                                         powder                                                                               (d)                                                                               30.7                                                                               2.32  17.2                                                     155                                                                               H     Cl H   OCH.sub.2 CH.sub.3                                                                   4-bromo-1-methyl-3-                                                                       orange                                                                              192-195                                                                             33.1                                                                               2.78                                                                               19.3                        pyrazolyl                                                                         powder                                                                               (d)                                                                               33.4                                                                               2.73  18.1                                                     156                                                                               OCH.sub.3                                                                            H  CH.sub.3                                                                           H     1-methyl-3-(tri-                                                                          tan solid                                                                           140-142                                                        fluoromethyl)-4-                                                                               (d)                                      pyrazolyl                                                                      157                                                                               H     Cl H   OCH.sub.2 CH.sub.3                                                                   2-fluoro-4-methyl-3-                                                                      brown                                                                               153-155                                                                             43.6                                                                               3.40                                                                               18.2                        pyridinyl                                                                         powder                                                                               (d)                                                                               43.5                                                                               3.28  17.0                                                     158                                                                               H     Cl H   OCH.sub.2 CH.sub.3                                                                   2,6-difluorophenyl                                                                        brown                                                                               168-170                                                                             41.8                                                                               2.25                                                                               13.9                                                         powder                                                                              (d)  41.9                                                                               2.51                                                                               14.1                        159                                                                               OCH.sub.3                                                                            H  Cl  H     4-methoxycarbonyl-3-                                                                      brown                                                                               167-172                                                                             42.3                                                                               3.04                                                                               17.6                        pyrdinyl                                                                          powder   42.3                                                                               3.14  16.5                                                     160                                                                               OCH.sub.3                                                                            H  CH.sub.3                                                                           H     2-chloro-4-ethoxy-3-                                                                      white                                                                               215-216                                                                             45.3                                                                               4.05                                                                               17.6                        pyridinyl                                                                         solid    45.3                                                                               3.76  17.6                                                     161                                                                               OC.sub.3 H.sub.7 (i)                                                                 H  Cl  H     2-chloro-4-ethoxy-3-                                                                      tan solid                                                                           203-204                                                                             47.9                                                                               4.73                                                                               16.4                        pyridinyl   48.0                                                                               5.06  16.2                                                     162                                                                               H     H  H   Cl    2,6-difluorophenyl                                                                        white                                                                               263-265                                                                             41.8                                                                               2.05                                                                               16.3                                                         powder    41.6                                                                               2.14                                                                               16.2                        163                                                                               H     H  H   Cl    4-bromo-1-methyl-3-                                                                       white                                                                               272-273                                                                             30.7                                                                               2.06                                                                               21.5                        pyrazolyl                                                                         powder                                                                               (d)                                                                               30.4                                                                               2.06  21.1                                                     164                                                                               H     H  H   Cl    2-fluoro-4-methyl-3-                                                                      yellow                                                                              213-216                                                                             42.2                                                                               2.65                                                                               20.5                        pyridinyl                                                                         powder   41.9                                                                               2.99  20.4                                                     165                                                                               H     H  H   OCH.sub.3                                                                            2,6-difluorophenyl                                                                        white                                                                               254-255                                                                             45.9                                                                               2.96                                                                               16.5                                                         powder    45.9                                                                               2.55                                                                               16.4                        166                                                                               H     H  H   OCH.sub.3                                                                            4-bromo-1-methyl-3-                                                                       off-white                                                                           214-216                                                                             34.1                                                                               2.86                                                                               21.7                        pyrazolyl                                                                         powder                                                                               (d)                                                                               34.0                                                                               3.04  21.5                                                     167                                                                               H     H  H   OCH.sub.3                                                                            2-fluoro-4-methyl-3-                                                                      white                                                                               204-206                                                                             46.3                                                                               3.59                                                                               20.8                        pyridinyl                                                                         powder   43.8                                                                               3.17  19.1                                                     168                                                                               OCH.sub.3                                                                            H  Cl  H     4-iodo-1-methyl-3-                                                                        white                                                                               222-226                                                                             28.2                                                                               2.15                                                                               17.9                        pyrazolyl                                                                         powder                                                                               (d)                                                                               28.6                                                                               2.14  18.1                                                     169                                                                               OCH.sub.3                                                                            H  Cl  H     2-chloro-4-methyl-3-                                                                      tan  197-199                                                                             40.2                                                                               2.86                                                                               18.0                        pyridinyl                                                                         powder   40.9                                                                               2.65  16.2                                                     170                                                                               OCH.sub.3                                                                            H  Cl  H     2-chloro-4-methoxy-3-                                                                     white                                                                               212-214                                                                             38.6                                                                               2.74                                                                               17.3                        pyridinyl                                                                         powder                                                                               (d)                                                                               39.6                                                                               3.35  15.1                                                     171                                                                               OCH.sub.3                                                                            H  Cl  H     2-methyl-6-methoxy-                                                                       white                                                                               190-192                                                                             46.8                                                                               3.68                                                                               13.6                                              carbonylphenyl                                                                            powder    46.7                                                                               3.98                                                                               13.5                        172                                                                               H     Cl H   OC.sub.3 H.sub.7 (n)                                                                 4-bromo-1-methyl-3-                                                                       yellow                                                                              185-187                                                                             34.7                                                                               3.14                                                                               18.7                        pyrazolyl                                                                         solid    34.9                                                                               3.31  18.1                                                     173                                                                               H     Cl H   OC.sub.3 H.sub.7 (n)                                                                 2-fluoro-4-methyl-3-                                                                      off-white                                                                           203-204                                                                             45.1                                                                               3.78                                                                               17.5                        pyridinyl                                                                         solid    45.3                                                                               3.60  17.1                                                     174                                                                               Cl    H  CH.sub.3                                                                           H     2-fluoro-4-ethyl-3-                                                                       white                                                                               223-225                                                                             45.5                                                                               3.54                                                                               18.9                        pyridinyl                                                                         solid    45.5                                                                               3.37  18.6                                                     175                                                                               Cl    H  CH.sub.3                                                                           H     4-bromo-1-methyl-3-                                                                       tan  240-242                                                                             33.1                                                                               2.78                                                                               19.3                        pyrazolyl                                                                         powder                                                                               (d)                                                                               33.8                                                                               3.04  18.9                                                     176                                                                               Cl    H  CH.sub.3                                                                           H     2,6-difluorophenyl                                                                        tan  234-236                                                                             42.2                                                                               3.07                                                                               13.8                                                         powder                                                                              (d)  42.3                                                                               2.85                                                                               14.4                        177                                                                               OC.sub.3 H.sub.7 (n)                                                                 H  Cl  H     2,6-difluorophenyl                                                                        white                                                                               199-200                                                                             44.7                                                                               3.25                                                                               13.9                                                         powder                                                                              (d)  44.7                                                                               3.24                                                                               13.6                        178                                                                               OCH.sub.3                                                                            H  CH.sub.3                                                                           H     2-fluoro-4-ethyl-3-                                                                       white                                                                               221-222                                                                             49.3                                                                               4.41                                                                               19.2                        pyridinyl                                                                         powder                                                                               (d)                                                                               49.5                                                                               4.23  19.1                                                     179                                                                               H     Cl H   OC.sub.3 H.sub.7 (i)                                                                 2,6-difluorophenyl                                                                        yellow                                                                              168-190                                                                             44.7                                                                               3.25                                                                               13.9                                                         solid     44.8                                                                               3.25                                                                               13.5                        180                                                                               H     Cl H   OC.sub.3 H.sub.7 (i)                                                                 2-fluoro-4-methyl-3-                                                                      yellow                                                                              228-230                                                                             45.1                                                                               3.78                                                                               17.2                        pyridinyl                                                                         solid (d)                                                                               45.1                                                                               3.76  16.6                                                     181                                                                               H     Cl H   OC.sub.3 H.sub.7 (i)                                                                 4-bromo-1-methyl-3-                                                                       white                                                                               209-210                                                                             34.7                                                                               3.14                                                                               18.7                        pyrazolyl                                                                         solid    34.5                                                                               3.02  18.6                                                     182                                                                               H     CH.sub.3                                                                          H   H     2,6-difluorophenyl                                                                        yellow                                                                              229-233                                                                             48.2                                                                               3.11                                                                               17.8                                                         powder                                                                              (d)  49.3                                                                               3.23                                                                               17.1                        183                                                                               H     H  H   CH.sub.3                                                                             2,6-difluorophenyl                                                                        yellow                                                                              221-223                                                                             48.2                                                                               3.11                                                                               17.3                                                         powder                                                                              (d)  48.5                                                                               3.13                                                                               16.8                        184                                                                               Cl    H  CH.sub.3                                                                           H     2-chloro-4-propoxy-3-                                                                     colorless                                                                           205-206                                                                             43.3                                                                               3.63                                                                               16.8                        pyridinyl                                                                         solid (d)                                                                               43.2                                                                               3.75  16.6                                                     185                                                                               OCH.sub.3                                                                            H  CH.sub.3                                                                           H     2-chloro-4-(1-methyl-                                                                     tan solid                                                                           243-245                                                                             43.3                                                                               3.63                                                                               16.8                                              ethoxy-3-pyridinyl                                                                             (d)  43.1                                                                               3.50                                                                               16.5                        186                                                                               OCH.sub.3                                                                            H  CH.sub.3                                                                           H     2-chloro-4-propoxy-3-                                                                     colorless                                                                           206-207                                                                             46.7                                                                               4.41                                                                               17.0                        pyridinyl                                                                         solid (d)                                                                               47.0                                                                               4.46  17.2                                                     187                                                                               OCH.sub.3                                                                            H  CH.sub.3                                                                           H     2-chloro-4-(1-methyl-                                                                     white                                                                               236-237                                                                             46.7                                                                               4.41                                                                               17.0                                              ethoxy-3-pyridinyl                                                                        solid                                                                               (d)  46.0                                                                               4.33                                                                               16.7                        188                                                                               OCH.sub.3                                                                            H  Cl  H     4-bromo-1-methyl-5-                                                                       tan  119 (d)                                                                             31.3                                                                               2.39                                                                               19.9                        pyrazolyl                                                                         powder   33.1                                                                               3.14  17.4                                                     189                                                                               OC.sub.3 H.sub.7 (i)                                                                 H  CH.sub.3                                                                           H     2,6-difluorophenyl                                                                        white                                                                               235-237                                                                             50.3                                                                               4.22                                                                               14.7                                                         powder    50.4                                                                               4.03                                                                               14.8                        190                                                                               OCH.sub.3                                                                            H  Cl  H     2-chloro-6-methoxy-                                                                       white                                                                               211-214                                                                             41.8                                                                               2.80                                                                               12.0                                              carbonylphenyl                                                                            powder    39.6                                                                               2.44                                                                               11.8                        191                                                                               OCH.sub.3                                                                            H  H   Cl    2,6-difluorophenyl                                                                        lt. grey                                                                            >300 41.7                                                                               2.42                                                                               15.0                                                         powder    41.7                                                                               2.58                                                                               15.1                        192                                                                               OCH.sub.3                                                                            H  H   Br    4-bromo-1-methyl-3-                                                                       lt. tan                                                                             >300 31.3                                                                               2.39                                                                               19.9                        pyrazolyl                                                                         powder   31.8                                                                               2.44  19.8                                                     193                                                                               OCH.sub.3                                                                            H  H   Br    2-fluoro-4-methyl-3-                                                                      lt. tan                                                                             >300 42.0                                                                               2.98                                                                               18.8                        pyridinyl                                                                         powder   42.1                                                                               3.19  18.9                                                     194                                                                               OCH.sub.3                                                                            H  CH.sub.3                                                                           H     4-chloro-1-methyl-3-                                                                      tan solid                                                                           235-237                                                                             40.4                                                                               3.67                                                                               23.6                        pyrazolyl   40.2                                                                               3.75  23.7                                                     195                                                                               OCH.sub.3                                                                            H  CH.sub.3                                                                           H     5-chloro-1-methyl-4-                                                                      tan solid                                                                           207-209                                                                             40.4                                                                               3.67                                                                               23.6                        pyrazolyl   40.2                                                                               4.08  23.5                                                     196                                                                               OCH.sub.2 --                                                                         H  CH.sub.3                                                                           H     4-bromo-1-methyl-3-                                                                       tan  244-246                                                                             36.0                                                                               3.26                                                                               19.4                           CH.sub.2 F                                                                  pyrazolyl                                                                         powder                                                                               (d)                                                                               36.7                                                                               3.15  18.9                                                     197                                                                               OCH.sub.2 --                                                                         H  Cl  H     2,6-difluorophenyl                                                                        tan  210-212                                                                             43.0                                                                               3.13                                                                               13.4                           CH.sub.2 OCH.sub.3            powder                                                                              (d)  43.1                                                                               3.27                                                                               13.1                        198                                                                               OCH.sub.3                                                                            H  Br  H     2,6-difluorophenyl                                                                        lt. tan                                                                             235-236                                                                             37.2                                                                               2.16                                                                               13.4                                                         powder                                                                              (d)  37.2                                                                               2.18                                                                               13.4                        199                                                                               OCH.sub.3                                                                            H  Br  H     2-fluoro-4-methyl-3-                                                                      lt. tan                                                                             210-211                                                                             37.5                                                                               2.66                                                                               16.8                        pyradinyl                                                                         powder                                                                               (d)                                                                               37.7                                                                               2.54  16.6                                                     200                                                                               OCH.sub.3                                                                            H  Br  H     4-bromo-1-methyl-3-                                                                       lt. tan                                                                             241-212                                                                             28.3                                                                               2.16                                                                               18.0                        pyrazolyl                                                                         powder                                                                               (d)                                                                               28.7                                                                               2.25  18.3                                                     201                                                                               OCH.sub.3                                                                            H  H   Br    2,6-difluorophenyl                                                                        off-white                                                                           >300 37.2                                                                               2.16                                                                               13.4                                                         powder    36.8                                                                               2.12                                                                               13.3                        202                                                                               OCH.sub.3                                                                            H  H   Br    2-fluoro-4-methyl-3-                                                                      tan  >300 37.5                                                                               2.66                                                                               16.8                        pyridinyl                                                                         powder   36.9                                                                               2.50  16.5                                                     203                                                                               OCH.sub.3                                                                            H  H   Br    4-bromo-1-methyl-3-                                                                       off-white                                                                           >300 28.3                                                                               2.16                                                                               18.0                        pyrazolyl                                                                         powder   28.5                                                                               2.13  17.9                                                     204                                                                               OCH.sub.3                                                                            H  CH.sub.3                                                                           H     2.4.5-trichloro-3-                                                                        colorless                                                                           235-236                                                                             36.9                                                                               2.38                                                                               16.6                        pyridinyl                                                                         solid (d)                                                                               37.0                                                                               2.49  16.5                                                     205                                                                               OCH.sub.2 CH.sub.3                                                                   H  CH.sub.3                                                                           H     2-chloro-4-ethoxy-3-                                                                      colorless                                                                           200-201                                                                             46.7                                                                               4.41                                                                               17.0                        pyridinyl                                                                         solid    46.7                                                                               4.18  16.9                                                     206                                                                               OCH.sub.2 CH.sub.3                                                                   H  CH.sub.3                                                                           H     2-chloro-4-methoxy-3-                                                                     white                                                                               239-240                                                                             45.3                                                                               4.05                                                                               17.6                        pyridinyl                                                                         solid (d)                                                                               45.1                                                                               4.13  17.4                                                     207                                                                               Cl    H  CH.sub.3                                                                           H     2-chloro-4-methoxy-                                                                       white                                                                               250-251                                                                             38.6                                                                               2.74                                                                               17.3                                              carbonyl-3-pyridinyl                                                                      powder                                                                              (d)  40.0                                                                               2.66                                                                               16.3                        208                                                                               OC.sub.3 H.sub.7 (i)                                                                 H  CH.sub.3                                                                           H     2-chloro-4-methoxy-3-                                                                     white                                                                               244-245                                                                             46.7                                                                               4.41                                                                               17.0                        pyridinyl                                                                         powder                                                                               (d)                                                                               46.2                                                                               4.11  16.9                                                     209                                                                               OCH.sub.2 CF.sub.3                                                                   H  CH.sub.3                                                                           H     2-chloro-4-methoxy-3-                                                                     white                                                                               222-224                                                                             39.9                                                                               2.90                                                                               15.5                        pyridinyl                                                                         solid (d)                                                                               39.6                                                                               2.53  15.1                                                     210                                                                               OCH.sub.2 CH.sub.3                                                                   H  CH.sub.3                                                                           H     2-chloro-4-(1-methyl-                                                                     white                                                                               217-218                                                                             47.9                                                                               4.73                                                                               16.4                                              ethoxy-3-pyridinyl                                                                        solid                                                                               (d)  47.6                                                                               4.69                                                                               16.3                        211                                                                               OCH.sub.2 CH.sub.3                                                                   H  CH.sub.3                                                                           H     4-ethoxycarbonyl-3-                                                                       white                                                                               191-192                                                                             50.4                                                                               4.46                                                                               17.4                        pyridinyl                                                                         powder                                                                               (d)                                                                               50.8                                                                               4.72  17.3                                                     212                                                                               OCH.sub.3                                                                            H  CH.sub.3                                                                           H     2-chloro-4-methoxy-                                                                       white                                                                               230-231                                                                             43.8                                                                               3.43                                                                               17.0                                              carbonyl-3-pyridinyl                                                                      powder                                                                              (d)  44.0                                                                               3.46                                                                               16.8                        213                                                                               OCH.sub.2 CH.sub.3                                                                   H  Cl  H     2-chloro-4-methyl-3-                                                                      lt. brown                                                                           229-230                                  pyridinyl                                                                         powder                                                                               (d)                                                                   214                                                                               OCH.sub.3                                                                            H  Cl  H     2-chloro-4-ethoxy-3-                                                                      lt. brown                                                                           161-162                                  pyridinyl                                                                         powder                                                                               (d)                                                                   215                                                                               OCH.sub.2 CH.sub.3                                                                   H  Cl  H     2-chloro-4-ethoxy-3-                                                                      lt. brown                                                                           203-204                                  pyridinyl                                                                         powder                                                                               (d)                                                                   216                                                                               OCH.sub.2 CH.sub.3                                                                   H  Cl  H     2-chloro-4-methoxy-3-                                                                     lt. brown                                                                           224-225                                                                             40.2                                                                               3.13                                                                               16.4                        pyridinyl                                                                         powder                                                                               (d)                                                                               40.6                                                                               3.26  16.6                                                     217                                                                               OCH.sub.3                                                                            H  CH.sub.3                                                                           H     2-methoxy-4-methyl-3-                                                                     white                                                                               235-237                                                                             49.6                                                                               4.72                                                                               19.3                        pyridinyl                                                                         powder                                                                               (d)                                                                               49.5                                                                               4.57  19.0                                                     218                                                                               OC.sub.3 H.sub.7 (i)                                                                 H  Cl  H     2-chloro-4-methyl-3-                                                                      tan solid                                                                           226-227                                                                             43.3                                                                               3.63                                                                               16.8                        pyridinyl                                                                               (d)                                                                               43.1                                                                               3.70  16.2                                                     219                                                                               OC.sub.3 H.sub.7 (i)                                                                 H  Cl  H     2-chloro-4-methoxy-3-                                                                     off-white                                                                           154-155                                                                             41.7                                                                               3.50                                                                               16.2                        pyridinyl                                                                         solid    41.4                                                                               3.26  15.7                                                     220                                                                               H     CF.sub.3                                                                          H   OCH.sub.3                                                                            2-chloro-4-methoxy-3-                                                                     off-white                                                                           225-227                                                                             38.4                                                                               2.53                                                                               16.0                        pyridinyl                                                                         solid    38.6                                                                               2.20  16.1                                                     221                                                                               H     CF.sub.3                                                                          H   OCH.sub.2 CH.sub.3                                                                   2-chloro-4-methoxy-3-                                                                     off-white                                                                           162-163                                                                             39.9                                                                               2.90                                                                               15.5                        pyridinyl                                                                         solid    37.5                                                                               3.22  14.7                                                     222                                                                               Cl    H  CH.sub.3                                                                           H     2-methoxy-4-methyl-3-                                                                     off-white                                                                           221-222                                                                             45.7                                                                               3.84                                                                               19.0                        pyridinyl                                                                         solid    45.3                                                                               3.95  19.2                                                     223                                                                               OCH.sub.3                                                                            H  H   Cl    2-chloro-4-methoxy-3-                                                                     off-white                                                                           >300 (d)                                                                            38.6                                                                               2.74                                                                               17.3                        pyridinyl                                                                         solid    38.4                                                                               2.75  17.1                                                     224                                                                               OC.sub.3 H.sub.7 (n)                                                                 H  H   Cl    2-chloro-4-methoxy-3-                                                                     off-white                                                                           168-170                                                                             41.7                                                                               3.50                                                                               16.2                        pyridinyl                                                                         powder                                                                               (d)                                                                               41.8                                                                               3.55  16.0                                                     225                                                                               OC.sub.2 H.sub.5                                                                     H  H   Cl    2-chloro-4-methoxy-3-                                                                     off-white                                                                           231-233                                                                             40.1                                                                               3.42                                                                               16.8                        pyridinyl                                                                         powder                                                                               (d)                                                                               40.3                                                                               3.31  16.3                                                     226                                                                               OCH.sub.3                                                                            H  CH.sub.3                                                                           H     2-fluoro-4-methoxy-3-                                                                     white                                                                               257-258                                                                             45.8                                                                               3.84                                                                               19.1                        pyridinyl                                                                         solid (d)                                                                               45.8                                                                               3.87  19.0                                                     227                                                                               OC.sub.2 H.sub.5                                                                     H  CH.sub.3                                                                           H     2-fluoro-4-methoxy-3-                                                                     white                                                                               240-241                                                                             47.2                                                                               4.23                                                                               18.4                        pyridinyl                                                                         solid (d)                                                                               46.7                                                                               4.55  18.1                                                     228                                                                               OCH.sub.3                                                                            H  H   Br    2-chloro-4-methoxy-3-                                                                     tan solid                                                                           220-222                                                                             34.8                                                                               2.47                                                                               15.6                        pyridinyl                                                                               (d)                                                                               34.9                                                                               2.47  15.5                                                     229                                                                               OCH.sub.3                                                                            H  H   Br    4-methoxycarbonyl-3-                                                                      tan  154-156                                                                             38.0                                                                               2.73                                                                               15.8                        pyridinyl                                                                         powder                                                                               (d)                                                                               38.2                                                                               2.79  15.6                                                     230                                                                               OCH.sub.3                                                                            H  CH.sub.3                                                                           H     2-chloro-4-(2,2,2-                                                                        white                                                                               213-214                                                                             39.9                                                                               2.90                                                                               15.5                        trifluoroethoxy)-3-                                                               solid    38.9                                                                               3.12  15.2                                                     pyridinyl                                                                      231                                                                               OC.sub.2 H.sub.5                                                                     H  CH.sub.3                                                                           H     2-chloro-4-(2,2,2-                                                                        white                                                                               211-212                                                                             41.3                                                                               3.25                                                                               15.0                        trifluoroethoxy)-3-                                                               solid    41.1                                                                               3.30  15.0                                                     pyridinyl                                                                      232                                                                               OCH.sub.3                                                                            H  CH.sub.3                                                                           H     2-bromo-4-methoxy-3-                                                                      white                                                                               214-215                                                                             39.3                                                                               3.30                                                                               16.4                        pyridinyl                                                                         solid (d)                                                                               39.0                                                                               3.46  16.0                                                     233                                                                               OC.sub.2 H.sub.5                                                                     H  CH.sub.3                                                                           H     2-bromo-4-methoxy-3-                                                                      off-white                                                                           245-246                                                                             40.7                                                                               3.65                                                                               15.8                        pyridinyl                                                                         solid (d)                                                                               40.9                                                                               3.85  15.9                                                     234                                                                               H     CH.sub.3                                                                          H   OCH.sub.3                                                                            2-chloro-4-methoxy-3-                                                                     tan  198-200                                                                             43.8                                                                               3.68                                                                               18.3                        pyridinyl                                                                         powder   43.0                                                                               3.76  17.9                                                     235                                                                               OCH.sub.3                                                                            H  CH.sub.3                                                                           H     2-fluoro-4-ethoxy-3-                                                                      white                                                                               253-255                                                                             47.2                                                                               4.23                                                                               18.4                        pyridinyl                                                                         solid    47.3                                                                               4.00  18.5                                                     236                                                                               OC.sub.2 H.sub.5                                                                     H  CH.sub.3                                                                           H     2-fluoro-4-ethoxy-3-                                                                      tan solid                                                                           206-208                                                                             48.6                                                                               4.59                                                                               17.7                        pyridinyl   48.7                                                                               4.72  17.9                                                     237                                                                               Cl    H  CH.sub.3                                                                           H     2-fluoro-4-ethoxy-3-                                                                      white                                                                               218-219                                                                             43.6                                                                               3.40                                                                               18.2                        pyridinyl                                                                         solid    43.6                                                                               3.38  18.4                                                     238                                                                               OC.sub.2 H.sub.5                                                                     H  CH.sub.3                                                                           H     2-chloro-4-(n)propoxy-                                                                    white                                                                               130-132                                                                             47.9                                                                               4.73                                                                               16.4                        3-pyridinyl                                                                       solid    47.6                                                                               4.67  16.4                                                     239                                                                               OCH.sub.3                                                                            H  CH.sub.3                                                                           H     2-chloro-4-(2-fluoro-                                                                     off-white                                                                           218-220                                                                             43.3                                                                               3.64                                                                               16.8                                              ethoxy)-3-pyridinyl                                                                       solid                                                                               (d)  43.1                                                                               3.60                                                                               16.7                        240                                                                               OC.sub.2 H.sub.5                                                                     H  CH.sub.3                                                                           H     2-chloro-4-(2-fluoro-                                                                     white                                                                               210-212                                                                             44.7                                                                               3.99                                                                               16.3                                              ethoxy)-3-pyridinyl                                                                       solid                                                                               (d)  44.5                                                                               4.19                                                                               16.6                        241                                                                               OC.sub.2 H.sub.5                                                                     H  H   Cl    2,6-difluorophenyl                                                                        white                                                                               >300 (d)                                                                            41.3                                                                               3.22                                                                               13.8                                                         powder    41.3                                                                               2.65                                                                               13.6                                                         hydrate                                       242                                                                               OCH.sub.3                                                                            H  H   Br    2-chloro-6-methoxy-                                                                       tan  202-204                                                                             37.9                                                                               2.54                                                                               11.8                                              carbonylphenyl                                                                            powder                                                                              (d)  37.8                                                                               2.56                                                                               11.6                        243                                                                               OCH.sub.3                                                                            H  CH.sub.3                                                                           H     4-bromo-1-methyl-3-                                                                       white                                                                               234-236                                                                             35.9                                                                               3.27                                                                               21.0                        pyrazolyl                                                                         powder   35.1                                                                               3.24  21.4                                                     244                                                                               OCH.sub.3                                                                            H  CH.sub.3                                                                           H     1-methyl-4-(tri-                                                                          tan solid                                                                           240-242                                                                             40.0                                                                               3.36                                                                               21.5                                              fluoromethyl)-3-     40.2                                                                               3.14                                                                               21.4                        pyrazolyl                                                                      245                                                                               Cl    H  CH.sub.3                                                                           H     1-methyl-3-(tri-                                                                          tan solid                                                                           211-212                                                                             36.8                                                                               2.85                                                                               19.8                                              fluoromethyl)-5-     36.8                                                                               2.74                                                                               19.8                        methoxy-4-pyrazolyl                                                            246                                                                               OCH.sub.3                                                                            H  CH.sub.3                                                                           H     1-methyl-3-(tri-                                                                          off-white                                                                           186-188                                                                             40.0                                                                               3.60                                                                               20.0                                              fluoromethyl)-5-                                                                          solid     38.8                                                                               3.52                                                                               19.4                        methoxy-4-pyrazolyl                                                            247                                                                               OC.sub.2 H.sub.5                                                                     H  CH.sub.3                                                                           H     1-methyl-3-(tri-                                                                          brown                                                                               205-207                                                                             41.5                                                                               3.94                                                                               19.4                                              fluoromethyl)-5-                                                                          solid     40.5                                                                               3.52                                                                               19.1                        methoxy-4-pyrazolyl                                                            248                                                                               OCH.sub.3                                                                            H  CH.sub.3                                                                           H     1,3-dimethyl-5-(tri-                                                                      off-white                                                                           247-249                                                                             41.6                                                                               3.74                                                                               20.8                                              fluoromethyl)-4-                                                                          solid     41.1                                                                               4.07                                                                               20.6                        pyrazolyl                                                                      249                                                                               OC.sub.2 H.sub.5                                                                     H  CH.sub.3                                                                           H     1,3-dimethyl-5-(tri-                                                                      tan solid                                                                           251-252                                                                             43.1                                                                               4.10                                                                               20.1                                              fluoromethyl)-4-     43.4                                                                               4.16                                                                               20.3                        pyrazolyl                                                                      250                                                                               OCH.sub.3                                                                            H  CH.sub.3                                                                           H     1-methyl-3-(tri-                                                                          off-white                                                                           226-228                                                                             36.8                                                                               2.85                                                                               19.8                                              fluoromethyl)-5-                                                                          solid     36.9                                                                               3.04                                                                               19.5                        chloro-4-pyrazolyl                                                             251                                                                               OC.sub.2 H.sub.5                                                                     H  CH.sub.3                                                                           H     1-methyl-3-(tri-                                                                          white                                                                               239-240                                                                             38.3                                                                               3.22                                                                               19.2                                              fluoromethyl)-5-                                                                          solid     38.6                                                                               3.46                                                                               19.2                        chloro-4-pyrazolyl                                                             252                                                                               Cl    H  H   OCH.sub.3                                                                            2,6-difluorophenyl                                                                        off-white                                                                           190-191                                                                             41.7                                                                               2.42                                                                               15.0                                                         powder                                                                              (d)  41.3                                                                               2.37                                                                               15.0                        253                                                                               Cl    H  H   OCH.sub.3                                                                            2-chloro-4-methoxy-3-                                                                     white                                                                               253-254                                                                             38.6                                                                               2.74                                                                               17.3                        pyridinyl                                                                         powder                                                                               (d)                                                                               38.8                                                                               2.90  17.4                                                     254                                                                               Cl    H  H   OCH.sub.3                                                                            1-methyl-4-bromo-3-                                                                       lt. tan                                                                             269-270                                                                             31.3                                                                               2.39                                                                               19.9                        pyrazoyl                                                                          powder                                                                               (d)                                                                               31.9                                                                               2.39  19.6                                                     255                                                                               OCH.sub.3                                                                            H  H   OCH.sub.3                                                                            2,6-difluorophenyl                                                                        off-white                                                                           319-320                                                                             45.1                                                                               3.27                                                                               15.1                                                         powder                                                                              (d)  43.4                                                                               3.13                                                                               14.8                        256                                                                               OCH.sub.3                                                                            H  H   OCH.sub.3                                                                            2-chloro-4-methoxy-3-                                                                     lt. tan                                                                             256-258                                                                             42.1                                                                               3.53                                                                               17.7                        pyridinyl                                                                         powder                                                                               (d)                                                                               41.7                                                                               2.85  17.3                                                     257                                                                               OCH.sub.3                                                                            H  H   OCH.sub.3                                                                            1-methyl-4-bromo-3-                                                                       tan  257-258                                                                             34.5                                                                               3.14                                                                               20.1                        pyrazoyl                                                                          powder                                                                               (d)                                                                               34.1                                                                               2.98  19.8                                                     258                                                                               OC.sub.2 H.sub.5                                                                     H  CH.sub.3                                                                           H     1,5-dimethyl-3-                                          (ethoxycarbonyl)-4-                                                            pyrazolyl                                                                      259                                                                               OCH.sub.3                                                                            H  F   H     4-bromo-1-methyl-3-                                      pyrazolyl                                                                      260                                                                               OCH.sub.3                                                                            H  CF.sub.3                                                                           H     2,6-difluorophenyl                                       261                                                                               H     F  H   OCH.sub.3                                                                            2,6-difluorophenyl                                       262                                                                               OCH.sub.3                                                                            H  H   F     2,6-difluorophenyl                                       263                                                                               OCH.sub.3                                                                            H  H   I     4-bromo-1-methyl-3-                                      pyrazolyl                                                                      __________________________________________________________________________

The compounds of Formula I wherein V represents hydrogen can generally be prepared by combining a 2-chlorosulfonyl[1,2,4]triazolo[1,5-a]pyridine compound of Formula II: ##STR7## with an appropriately substituted aromatic primary amine compound of Formula III: ##STR8## in the presence of pyridine or a methylpyridine compound, and, optionally but preferably, a catalytic amount of dimethyl sulfoxide. The substituents W, X, Y, and Z of Formula II and the substituents A, B, J, D, A', B', D', A", B", and T are as defined hereinbefore for the compounds of Formula I. Compounds of Formula II wherein one or both of W and Z represents Cl or OCH₃ or wherein W represents OCH₂ CH₃ or OC₃ H₇ (i) are often preferred as are compounds of Formula II wherein two of W, X, Y, and Z represent hydrogen.

The preparation is usually accomplished by placing a 2-chlorosulfonyl[1,2,4]triazolo[1,5-a]pyridine compound of Formula II, an aromatic amine compound of Formula III, and an inert solvent, such as acetonitrile, N,N-dimethylformamide, N-methyl-2-pyrrolidinone, tetrahydrofuran, and the like, in a vessel and then adding the pyridine or methylpyridine, preferably pyridine, and a catalytic amount of dimethyl sulfoxide. The mixture is allowed to react, typically at ambient temperature, but heating if necessary. After a substantial quantity of the compound of Formula I has formed or a substantial quantity of the chlorosulfonyl compound of Formula II has been consumed, the desired product is recovered, typically by removing the solvent by evaporation, adding water, and removing the liquids from the solid that forms by centrifugation or filtration. The recovered product can be purified, if desired, by extracting with an immiscible organic solvent, such as methylene chloride, and with water. Alternatively, the desired compounds of Formula I can be purified by recrystallization and by other commonly used methods.

Approximately equimolar quantities of the compounds of Formulas II and III are generally used in the preparation of compounds of Formula I although a substantial excess of one or the other may be employed. The pyridine compound is generally employed in an amount of from at least 1 to about 5 moles per mole of compound of Formula II. Dimethyl sulfoxide is typically used in less than an equimolar amount; amounts over about 0.3 mole per mole of compound of Formula II are usually deleterious. Acetonitrile is often the preferred solvent.

It is sometimes advantageous to prepare the compounds of Formula I by condensing a compound of Formula II with an N-trialkylsilyl derivative of a substituted aromatic amine compound of Formula III. The method employed is analogous to that described in U.S. Pat. No. 4,910,306 for N-trialkylsilylanilines. The reaction conditions required are essentially the same as those described hereinabove for the condensation of a chlorosulfonyl compound of Formula II with a substituted aromatic amine of Formula III with the exception that the pyridine compound base may be omitted. The substituted N-trialkylsilyl derivatives of aromatic amines employed can be prepared from the corresponding substituted aromatic amine compounds by treatment with a trialkylsilyl halide and a trialkylamine essentially as described in U.S. Pat. No. 4,910,306 for aniline compounds. Sodium iodide is typically employed as a catalyst when the halide is chloride. The N-trialkylsilyl compounds are typically prepared and used immediately and without purification.

Compounds of Formula I wherein V represents hydrogen and W, Y, or Z represents OCH₂ CF₃, S(C₁ -C₃)alkyl, or O(C₁ -C₃)alkyl optionally monosubstituted with F, Cl, or OCH₃ can be made from the corresponding compounds of Formula I wherein W, Y, or Z represents F, Cl, or Br by treatment with an appropriate nucleophilic reagent, such as sodium methoxide or sodium methanethiolate in methanol, acetonitrile, or dimethyl sulfoxide. Similarly, such compounds wherein W, Y, or Z represents F or Br can sometimes be made from corresponding compounds wherein W, Y, or Z represents Cl by treatment with an alkali metal halide, such as potassium fluoride. Typically, chloro compounds are the most readily available and are employed. The reaction conditions employed are similar to those used for the related exchange reactions of 2- and 4-halopyrimidines and pyridines. Non-aqueous media are preferred. The amount of heat and the time required are dependent on the position of the halogen, the identity of the halogen, the other substituents present, and the medium employed. The selective replacement of a halogen in the W position can readily be achieved as this halogen is much more reactive than are halogens in the X, Y, and Z positions. Halogens in the Z position are more reactive than those in the X position.

Many compounds of Formula I wherein one or more of X and Z represents F, Cl, Br, or H can be also be prepared by first preparing a compound of Formula I wherein one or both of X and Z represents nitro, reducing the nitro group to an amino group using standard reaction procedures for the reduction of a nitro group to an amino group well-known to those in the art, and then converting the amino group to a F, Cl, Br, I, OH, or H group by diazotization under appropriate reaction conditions generally known in the art.

Compounds of Formula I wherein V represents COR', CO₂ R", or CONR'"₂ wherein R', R", and R'" are as defined hereinabove can be prepared from compounds of Formula I wherein V represents hydrogen by acylation with a compound of the formula ClCOR', ClCO₂ R", or ClCONR'"₂ using conventional procedures known in the art for the acylation of sulfonamides.

The 2-chlorosulfonyl[1,2,4]triazolo[1,5-a]pyridine compounds of Formula II can be prepared by chloroxidation of 2-benzylthio[1,2,4]triazolo[1,5-a]pyridine compounds of Formula IV: ##STR9## wherein W, X, Y, and Z are as defined hereinabove. Such compounds wherein one or both of W and Z represents Cl or OCH₃ or wherein W represents OCH₂ CH₃ or OC₃ H₇ (i) are often preferred as are compounds wherein two of W, X, Y, and Z represent hydrogen. The chloroxidation reaction can be carried out under the reaction conditions usually employed for such reactions. In a typical operation, the compound of Formula IV is dissolved or suspended in a water-immiscible organic solvent, such as chloroform or dichloromethane, water is added, and chlorine is added with good agitation to the mixture at temperatures below about 20° C. When the reaction is complete, the organic solvent phase is separated and washed with water and the solvent is typically removed by evaporation to obtain the desired chlorosulfonyl compound as a crude product. This crude product can be purified by standard methods, such as by recrystallization, extraction, or chromatography.

Compounds of Formula IV wherein W, Y, or Z represents I, F, OCH₂ CF₃, S(C₁ -C₃)alkyl, or O(C₁ -C₃)alkyl optionally monosubstituted with F, Cl, or OCH₃ can be made from the corresponding compounds of Formula IV wherein W, Y, or Z represents F, Cl, or Br by treatment with an appropriate nucleophilic reagent, such as sodium methoxide or sodium methanethiolate in methanol or potassium ethoxide in ethanol, acetonitrile, or dimethyl sulfoxide. The reaction conditions are similar to those employed to make the corresponding conversion of compounds of Formula I wherein W, Y, or Z represents F, Cl, or Br to analogs wherein W, Y, or Z represents OCH₂ CF₃, S(C₁ -C₃)alkyl or O(C₁ -C₃)alkyl optionally monosubstituted with F, Cl, or OCH₃. Heat is applied, if necessary, to accelerate the reaction. Compounds of Formula IV wherein W represents F, OCH₂ CF₃, S(C₁ -C₃)alkyl or O(C₁ -C₃)alkyl optionally monosubstituted with F, Cl, or OCH₃ and one or more of X, Y, and Z represents Cl or Br can be made in this way from compounds wherein W and one or more of X, Y, and Z represents chloro or bromo by the selective reaction of the chloro or bromo substituent in the 5-position (W) because it is considerably more easily displaced. Similarly, compounds of Formula IV wherein Z represents F, OCH₂ CF₃, S(C₁ -C₃)alkyl or O(C₁ -C₃)alkyl optionally monosubstituted with F, Cl, or OCH₃ and X represents chloro or bromo can be made from compounds wherein both X and Z represent chloro or bromo by selective reaction.

Compounds of Formula IV wherein W represents Cl can be prepared in three steps from a substituted glutaconic anhydride. The anhydride is first treated with the reaction product of thiosemicarbazide and benzyl chloride in the presence of a tertiary amine, such as triethylamine, and in a solvent, such as 2-propanol. The reaction can be carried out by heating the reaction mixture described for a period, adding an alkali metal alkoxide, such as sodium methoxide and heating for another period, and then acidifying the reaction mixture and recovering the insoluble solid product that forms. This solid product can then converted to a compound of Formula IV wherein W represents OH by carefully heating until the evolution of carbon dioxide ceases. This compound of Formula I wherein W represents OH can then be converted to the corresponding compound wherein W represents Cl by combining it with an excess of phosphorus oxychloride and a tertiary amine, such as N,N-dimethylaniline, and heating. The product can then be recovered by removing the excess phosphorus oxychloride by evaporation under reduced pressure.

Compounds of Formula IV wherein one or both of X and Z represents F, Cl, Br, I, OH, or H can also be prepared by first preparing a compound of Formula IV wherein one or both of X and Z represents nitro, reducing the nitro group to an amino group using standard reaction procedures for the reduction of a nitro group to an amino group well-known to those in the art, and then converting the amino group to a F, Cl, Br, I, OH, or H group by diazotization under appropriate reaction conditions. Compounds wherein one of X and Z represents OR can be prepared from the corresponding compound wherein one of X and Z represents OH by consecutive treatment with phosphorus oxychloride and an alkali metal salt of the alcohol ROH. Compounds wherein W and/or Y represents chloro or bromo can be obtained by halogenation of the amino compounds before diazotization. Appropriate reaction conditions for such reactions are generally known in the art.

It has been found, however, that the reduction of a compound of Formula IV wherein W and X represent hydrogen, Y represents hydrogen, methyl, or a halogen, and Z represents nitro (2-benzylthio-8-nitro[1,2,4]triazolo[1,5-a]pyridine and certain 7-substituted analogs) with stannous chloride in the presence of stannic chloride and a reactive medium comprising hydrogen chloride or a C₁ -C₃ alcohol produces not only the corresponding compound of Formula IV wherein Z represents amino, but also the corresponding compound of Formula IV wherein W represents chloro or alkoxy and Z represents amino. The latter can be made to be the dominate product. The amino compounds obtained can be converted into compounds of Formula IV wherein W represents chloro or alkoxy and Z represents hydrogen or a halogen by standard means.

When the reactive medium contains hydrogen chloride as an essential ingredient, an 8-amino-2-benzylthio-5-chloro[1,2,4]triazolo[1,5-a]pyridine compound is obtained along with a small amount of an 8-amino-2-benzylthio[1,2,4]triazolo[1,5-a]pyridine compound. The reactive medium generally includes a solvent, which can be water, N-methyl-2-pyrrolidinone, N,N-dimethylformamide, dimethyl sulfoxide, tetrahydrofuran, or other suitable solvent. Concentrated aqueous hydrochloric acid is the generally preferred reactive medium in this embodiment. When the reactive medium contains an alcohol as an essential ingredient, a 5-alkoxy-8-amino-2-benzylthio[1,2,4]triazolo[1,5-a]pyridine compound is obtained. Methanol, ethanol, and propanol are examples of suitable alcohols. The reaction is generally carried out by combining one molar equivalent of a 2-benzylthio-8-nitro[1,2,4]triazolo[1,5-a]pyridine compound with at least about 3 molar equivalents of stannous chloride, one molar equivalent of stannic chloride, and an excess of hydrogen chloride or at least one molar equivalent of the alcohol. The alcohols are typically employed in a large excess. The reaction mixture is heated at about 50° to about 120° C. with good agitation to effect the simultaneous reduction and substitution. The products can be recovered by standard means, including by dissolving the hydrochloride that is formed initially in water, basifying with an alkali metal hydroxide, and recovering the product by filtration or by solvent extraction.

Compounds of Formula IV wherein one or both of X and Z represents nitro can be prepared from (3 or 5)-nitro-2-hydrazinopyridine compounds by consecutive reactions with carbon disulfide, hydrogen peroxide, and benzyl chloride and triethylamine. The reactions take place at ambient temperatures and are exothermic. A reaction period of up to several days is sometimes required to assure that all of the product is in the desired, rearranged state, but rearrangement takes place spontaneously under the reaction conditions. The method is similar to that disclosed in the art for the preparation of 2-benzylthio[1,2,4]triazolo[1,5-c]pyrimidine compounds.

Many compounds of Formula IV can be prepared by the reaction 1-((1-imidazolylthionyl)amino)-2-iminopyridine compounds of Formula V: ##STR10## with benzyl chloride in a solvent, such as butanol, by heating. The desired compounds of Formula V can be recovered by conventional means.

Compounds of Formula V can be prepared by combining O-mesitylenesulfonylacetohydroxamate and perchloric acid in dioxane at temperatures below ambient, adding the solution obtained to 2-aminopyridine compounds of Formula VI: ##STR11## at temperatures below ambient, and then adding 1,1'-thiocarbonyldiimidazole to the mixture. The desired compounds of Formula VI can be recovered by conventional means.

It has additionally been found that compounds of Formula IV can be prepared from the corresponding 2-amino[1,2,4]triazolo[1,5-a]pyridine of Formula VII: ##STR12## wherein W, X, Y, and Z are as defined for compounds of Formula I. Compounds of Formula VII wherein one or both of W and Z represents Cl or OCH₃ or wherein W represents OCH₂ CH₃ or OC₃ H₇ (i) are often preferred as are compounds of Formula II wherein two of W, X, Y, and Z represent hydrogen. The method is closely related to the chemistry disclosed in J. Chemical Society Chemical Communications, 1980 756-757. It is especially useful for the preparation of compounds of Formula I wherein W represents chloro, methoxy, ethoxy, or isopropoxy, X and Z each represent hydrogen, and Y represents methyl or a halogen; or wherein W represents chloro, methoxy or ethoxy, X and Y each represent hydrogen, and Z represents methyl, methoxy, or a halogen; or wherein Z represents chloro, methoxy or ethoxy, W and Y each represent hydrogen, and X represents methyl, trifluoromethyl, or a halogen. The preparation is preferably carried out by adding an excess of t-butyl nitrite to a solution consisting of a compound of Formula VII and dibenzyl disulfide in a compatible organic solvent, such as acetonitrile, and heating the combination to reflux until the evolution of gas subsides. The reaction is exothermic. The desired compounds of Formula IV can be recovered by conventional means, such as by removing the volatile components of the product mixture by evaporation, and can be purified by conventional means, such as by column chromatography or recrystallization.

Compounds of Formula VII can be prepared by treatment of appropriately substituted N-(2-pyridinyl)-N-carboethoxythiourea compounds with hydroxylamine in a solvent such as ethanol and heating for a few hours. The hydroxylamine is typically generated by neutralization of the hydrochloride with a hindered tertiary amine, such as diisopropylethylamine, or an alkoxide, such as sodium ethoxide. The desired compounds of Formula VII can be recovered by conventional means, such as by removal of the volatile components of the reaction mixture by evaporation, and can be purified by conventional means, such as by extraction with water and/or other solvents in which they are sparingly soluble. N-(2-Pyridinyl)-N-carboethoxythiourea compounds can be obtained by treatment of appropriately substituted 2-aminopyridine compounds with ethoxycarbonyl isothiocyanate. Compounds of Formula VII can also be prepared from 2-cyanoaminopyridine compounds by the methods disclosed in Monatshefte fur Chemie, 114, 789-798 (1983).

The substituted anilines and 3-, 4-, and 5-aminopyrazoles that are required as intermediates for the compounds of Formula I are known in the art or can be prepared by general methods known in the art. The substituted 3-aminopyridines and 3-aminoindazoles that are required as intermediates can be prepared by the methods presented herein, are known in the art, or can be prepared by general methods known in the art.

4-Alkoxy-3-amino-2-chloropyridine compounds can be prepared by chlorination of known 4-alkoxy-3-aminopyridine compounds. 4-Alkoxy-3-amino-2-fluoropyridine compounds can be prepared from 4-alkoxy-2-fluoropyridine compounds by lithiation with butyl lithium and treatment of the intermediate with diphenyl phosphoryl azide. 4-Alkoxy-2-fluoropyridine compounds can be prepared by reduction of 4-Alkoxy-3,5-dichloro-2-fluoropyridine compounds with hydrogen. Many 4-substituted 2-alkoxy-3-aminopyridine compounds can be prepared from 2-alkoxy-3-aminopyridine compounds by lithiation of the corresponding t-butoxycarbonyl derivative and reaction of this with an electrophilic reagent in processes closely related to those disclosed in J. Organic Chemistry, 60, 1875-1877 (1995). Thus, 2-alkoxy-3-amino-4-fluoropyridine compounds can be prepared from t-butyl N-(2-alkoxy-3-pyridinyl)carbamates by fluorination with N-fluorodibenzenesulfonimide of the intermediate obtained on lithiation with t-butyl lithium followed by treatment with anhydrous p-toluenesulfonic acid to remove the protecting t-butoxycarbonyl group. Similarly, 2-alkoxy-3-amino-4-chloropyridine compounds can be obtained by chlorination of t-butyl N-(2-alkoxy-3-pyridinyl)carbamates with hexachloroethane in an analogous process. Alkyl 3-amino-2-alkoxyisonicotinate compounds can be prepared analogously from t-butyl N-(2-alkoxy-3-pyridinyl)carbamate compounds by lithiating with butyl lithium, treating the intermediate formed with carbon dioxide and then an alkyl iodide, and finally removing the protecting t-butoxycarbonyl group by treatment with anhydrous p-toluenesulfonic acid. The amine protected t-butyl N-(2-alkoxy-3-pyridinyl)carbamate compounds can be prepared from 2-alkoxy-3-aminopyridine compounds by treatment with di-t-butyl dicarbonate. 3-Amino-2-chloroisonicotinic acid esters can be prepared by chlorination of 3-aminoisonicotinic acid esters using 1,3-dichloro-5,5-dimethylhydantion as the chlorinating agent. 3-Amino-2-fluoro-4-methylpyridine can be prepared by palladium on carbon catalyzed reduction of 2-fluoro-4-methyl-3-nitropyridine with hydrogen. This compound can be converted to other 4-alkyl-3-amino-2-fluoropyridine compounds by alkylation of the methyl group. These and other 3-aminopyridine compounds of Formula III can be made using a variety of preparative methods well-established in the art.

while it is possible to utilize the 1,2,4-triazolo[1,5-a]pyridine-2-sulfonamide compounds of Formula I directly as herbicides, it is preferable to use them in mixtures containing an herbicidally effective amount of the compound along with at least one agriculturally acceptable adjuvant or carrier. Suitable adjuvants or carriers should not be phytotoxic to valuable crops, particularly at the concentrations employed in applying the compositions for selective weed control in the presence of crops, and should not react chemically with the compounds of Formula I or other composition ingredients. Such mixtures can be designed for application directly to weeds or their locus or can be concentrates or formulations which are normally diluted with additional carriers and adjuvants before application. They can be solids, such as, for example, dusts, granules, water dispersible granules, or wettable powders, or liquids, such as, for example, emulsifiable concentrates, solutions, emulsions or suspensions.

Suitable agricultural adjuvants and carriers that are useful in preparing the herbicidal mixtures of the invention are well known to those skilled in the art.

Liquid carriers that can be employed include water, toluene, xylene, petroleum naphtha, crop oil, acetone, methyl ethyl ketone, cyclohexanone, trichloroethylene, perchloroethylene, ethyl acetate, amyl acetate, butyl acetate, propylene glycol monomethyl ether and diethylene glycol monomethyl ether, methanol, ethanol, isopropanol, amyl alcohol, ethylene glycol, propylene glycol, glycerine, and the like. Water is generally the carrier of choice for the dilution of concentrates.

Suitable solid carriers include talc, pyrophyllite clay, silica, attapulgus clay, kieselguhr, chalk, diatomaceous earth, lime, calcium carbonate, bentonite clay, Fuller's earth, cotton seed hulls, wheat flour, soybean flour, pumice, wood flour, walnut shell flour, lignin, and the like.

It is frequently desirable to incorporate one or more surface-active agents into the compositions of the present invention. Such surface-active agents are advantageously employed in both solid and liquid compositions, especially those designed to be diluted with carrier before application. The surface-active agents can be anionic, cationic or nonionic in character and can be employed as emulsifying agents, wetting agents, suspending agents, or for other purposes. Typical surface active agents include salts of alkyl sulfates, such as diethanolammonium lauryl sulfate; alkylarylsulfonate salts, such as calcium dodecylbenzenesulfonate; alkylphenol-alkylene oxide addition products, such as nonylphenol-C₁₈ ethoxylate; alcohol-alkylene oxide addition products, such as tridecyl alcohol-C₁₆ ethoxylate; soaps, such as sodium stearate; alkylnaphthalenesulfonate salts, such as sodium dibutylnaphthalenesulfonate; dialkyl esters of sulfosuccinate salts, such as sodium di(2-ethylhexyl) sulfosuccinate; sorbitol esters, such as sorbitol oleate; quaternary amines, such as lauryl trimethylammonium chloride; polyethylene glycol esters of fatty acids, such as polyethylene glycol stearate; block copolymers of ethylene oxide and propylene oxide; and salts of mono and dialkyl phosphate esters.

Other adjuvants commonly utilized in agricultural compositions include antifoam agents, compatibilizing agents, sequestering agents, neutralizing agents and buffers, corrosion inhibitors, dyes, odorants, penetration aids, spreading agents, sticking agents, dispersing agents, thickening agents, freeze point depressants, antimicrobial agents, and the like. The compositions can also contain other compatible components, for example, other herbicides, plant growth regulants, fungicides, insecticides, and the like and can be formulated with liquid fertilizers or solid, particulate fertilizer carriers such as ammonium nitrate, urea and the like.

The concentration of the active ingredients in the herbicidal compositions of this invention is generally from about 0.001 to about 98 percent by weight. Concentrations from about 0.01 to about 90 percent by weight are often employed. In compositions designed to be employed as concentrates, the active ingredient is generally present in a concentration from about 5 to about 98 weight percent, preferably about 10 to about 90 weight percent. Such compositions are typically diluted with an inert carrier, such as water, before application. The diluted compositions usually applied to weeds or the locus of weeds generally contain about 0.001 to about 5 weight percent active ingredient and preferably contain about 0.01 to about 0.5 percent.

The present compositions can be applied to weeds or their locus by the use of conventional ground or aerial dusters, sprayers, and granule applicators, by addition to irrigation water, and by other conventional means known to those skilled in the art.

The compounds of Formula I have been found to be useful preemergence and postemergence herbicides. They can be employed at non-selective (higher) rates of application to control essentially all of the vegetation in an area and, often, at selective (lower) rates of application for the selective control of undesirable vegetation in grass crops, such as corn, wheat, barley, and rice as well as in broadleaf crops, such as soybeans and cotton. While each of the compounds encompassed by Formula I is within the scope of the invention, the degree of herbicidal activity, the selectivity, and the spectrum of weed control obtained varies depending upon the substituents present. The selection of a specific compound of the invention for a specific application can be done readily without invention from the data and information presented herein along with standard testing.

The term herbicide is used herein to mean an active ingredient which controls or adversely modifies the growth of plants. An herbicidally effective or vegetation controlling amount is an amount of active ingredient which causes an adversely modifying effect and includes deviations from natural development, killing, regulation, dessication, retardation, and the like. The terms plants and vegetation are meant to include germinant seeds, emerging seedlings and established vegetation.

Herbicidal activity is exhibited by the compounds of the present invention when they are applied directly to the plant or to the locus of the plant at any stage of growth or before emergence. The effect observed depends upon the plant species to be controlled, the stage of growth of the plant, the application parameters of dilution and spray drop size, the particle size of solid components, the environmental conditions at the time of use, the specific compound employed, the specific adjuvants and carriers employed, the soil type, and the like, as well as the amount of chemical applied. These and other factors can be adjusted as is known in the art to promote selective herbicidal action. Generally, it is preferred to apply the compounds of Formula i postemergence to relatively immature plants to achieve the maximum control of broadleaf weeds.

Application rates of about 0.001 to about 1 Fg/Ha are generally employed in postemergence operations; for preemergence applications, rates of about 0.01 to about 10 Kg/Ha are generally employed.

EXAMPLES

The following Examples are presented to illustrate the various aspects of this invention and should not be construed as limitations to the claims.

1. Preparation of 1-((1-Imidazolylthionyl)amino)-2-aminopyridine

A solution of ethyl O-mesitylenesulfonylacetohydroxamate (39.5 g (grams), 0.138 mol (mole)) in dioxane (225 mL (milliliters)), which was prepared according to Tetrahedron Letters 40, 4133-4135 (1972), was cooled to about 8° C. Perchloric acid (17.4 mL of 70 percent, 0.203 mol) was added dropwise with stirring over 5 min (minutes). The reaction was then allowed to warm to room temperature over 1.5 hours. It was then diluted with ice water and the solids that formed were recovered by filtration and washed with water. The damp solids obtained were mixed with chloroform (300 mL) and the organic layer that formed was added dropwise with stirring and cooling to a solution of 2-aminopyridine (12.4 g, 0.131 mol) in chloroform (300 mL) at 5° C. The temperature rose to 10° C. during the addition. The reaction was allowed to warm to room temperature and then 1,1'-thiocarbonyldiimidazole (30.0 g, 0.168 mol) was added and the mixture was warmed to 40° C. for several hours. The mixture was then cooled in an ice bath and the solid that slowly separated was recovered by filtration to obtain the 10.4 g (36 percent of theory) of title compound as a white powder melting at 174°-175° C.(d).

¹ H NMR (Nuclear Magnetic Resonance Spectroscopy (200 megahertz)) (DMSO-d₆ (dimethyl sulfoxide)): 8.48 (s, 1H), 7.90 (s, 1H), 7.87 (d, 1H, J=4.0), 7.73 (t, 1H, J=4.0), 7.6-8.0 (broad s, 2H), 7.04 (d, 1H, J=4.0) 6.93 (s, 1H), 6.83 (t, 1H, J=4.0).

Elemental Analysis C₉ H₉ N₅ S Calc.: %C, 49.3; %H, 4.14; %N, 31.9; %8, 14.6 Found: %C, 49.5; %H, 4.06; %N, 32.2; %S, 14.3

2. Preparation of 2-Benzylthio[1,2,4]triazolo[1,5-a]pyridine

1-((1-Imidazolylthionyl)amino)-2-iminopyridine (9.9 g, 0.045 mol), benzyl chloride (8.6 g, 0.068 mol) and 1-propanol (100 mL) were mixed and heated to reflux for 2 hours. The solvent was removed by evaporation under reduced pressure and the residue obtained was mixed with dichloromethane. The resulting solution was washed with water and concentrated by evaporation under reduced pressure. The residue obtained was triturated with hexane to obtain 9.4 g (86 percent of theory) of the title compound as a white powder melting at 79°-81° C.

¹ H NMR (DMSO-d₆): 8.85 (d, 1H, J=4.0), 7.72 (d, 1H, J=4.0), 7.63 (t, 1H, J=4.0), 7.2-7.5 (m, 5H), 7.12 (t, 1H, J=4.0), 4.50 (s, 2H); ¹³ C NMR (DMSO-d₆): 163.7, 150.9, 137.6, 130.6, 129.5, 128.8, 128.7, 128.5, 128.4, 127.2, 114.6, 113.7, 34.6.

Elemental Analysis C₁₃ H₁₁ N₃ S Calc.: %C, 64.7; %H, 4.59; %N,17.4; %S, 13.3 Found: %C, 64.5; %H, 4.86; %N,17.3; %S, 11.8

3. Preparation of 2-Chlorosulfonyl[1,2,4triazolo[1,5-a]pyridine

2-Benzylthio[1,2,4]triazolo[1,5-a]pyridine (8.6 g, 0.036 mol) was dissolved in dichloromethane (75 mL) and water (75 mL) and cooled in an ice bath with very good stirring. Chlorine (11.9 g, 0.168 mol) was added slowly at 3°-7° C. and was given another half hour to react. The layers were separated and the organic layer was dried over magnesium sulfate and sodium sulfate and then concentrated by evaporation under reduced pressure to obtain an oily residue. The residue was triturated with hexane to obtain 6.0 g (78 percent of theory) of the title compound as white powder melting at 116°-118° C.

¹ H NMR (CDCl₃): 8.74 (dt, 1H, J=3.4, 0.5), 7.94 (dt, 1H, J=3.4, 0.5), 7.79 (td, 1H, J=3.4, 0.5), 7.38 (td, 1H, J=3.4, 0.5); ¹³ C NMR (CDCl₃): 164.2, 151.0, 132.7, 129.6, 118.5, 117.5.

4. Preparation of N-(2,6-Dichlorophenyl[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide

Chlorotrimethylsilane (7.0 mL, 6.0 g, 0.055 mol), triethylamine (7.7 mL, 5.6 g, 0.055 mol) and 2,6-dichloroaniline (4.5 g, 0.027 mol) were added with stirring to a solution of anhydrous sodium iodide (8.3 g, 0.055 mol) in acetonitrile (75 mL) and the resulting mixture was stirred for another half hour. The volatile materials were removed by evaporation under reduced pressure and the residue obtained was extracted into ether. The extract was concentrated by evaporation under reduced pressure and the residue obtained was added to a solution of 2-chlorosulfonyl[1,2,4]triazolo[1,5-a]pyridine (2.0 g, 0.0092 mol)in acetonitrile (50 mL) with stirring. Dimethyl sulfoxide (130 μL, 0.144 g, 0.0018 mol) was then added and the mixture was allowed to react for 3.5 hours. The solvent was then removed by evaporation under reduced pressure and the residue obtained was diluted with dichloromethane. The resulting solution was washed well with water, dried over magnesium sulfate and concentrated by evaporation under reduced pressure. The residue obtained was triturated with hexane and the solids that formed were recovered by filtration. The solids were washed with ether and a small amount of dichloromethane to obtain 2.1 g (68 percent of theory) of the title compound as a white powder melting at 269°-270° c.

¹ H NMR (DMSO-d₆): 10.86 (s, 1H), 9.08 (d, 1H, J=3.4), 7.98 (d, 1H, J=4.4), 7.82 (t, 1H, J=4.4), 7.28-7.52 (m, 4H).

Elemental Analysis C₁₂ H₈ Cl₂ N₄ O₂ S Calc.: %C, 42.0; %H, 2.35; %N, 16.3; %S, 9.34 Found: %C, 41.9; %H, 2.22; %N, 16.3; %S, 9.08

N-(2,6-Difluorophenyl[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide, a white powder melting at 222°-223° C., was prepared by the same procedure in 56 percent yield.

¹ H NMR (DMSO-d₆): 10.75 (s, 1H), 9.07 (d, 1H, J=3.5 , 7.98 (d, 1H, J=4.5), 7.83 (t, 1H, J=3.5), 7.02-7.48 (m, 5H).

Elemental Analysis C₁₂ H₈ F₂ N₄ O₂ S Calc.: %C, 46.5; %H, 2.60; %N, 18.1; %S, 10.3 Found: %C, 46.5; %H, 2.56; %N, 18.2; %S, 10.2

5. Preparation of 1,2-Diamino-4,6-dimethylpyridinium mesitylate

A solution of ethyl O-mesitylenesulfonylacetohydroxamate (51.0 g, 0.179 mol) in dioxane (300 mL) was cooled until the dioxane started to freeze. Seventy percent perchloric acid (22.5 mL, 0.263 mol) was then added dropwise and the reaction was allowed to warm to room temperature. After 1.5 hours the mixture was diluted with water and filtered and the collected solids were washed well with water. The damp solids were mixed with chloroform and the resulting organic solution portion of the mixture obtained was added slowly to an ice-cooled (5° C.) solution of 2-amino-4,6-dimethylpyridine (21.0 g, 0.172 mol) in chloroform (300 mL). The reaction was warmed to room temperature overnight and was then heated at reflux for several hours. The solvent was evaporated and the residue was triturated with ether and a small amount of chloroform. The resulting solid was recovered by filtration and rinsed with chloroform to obtain 22.9 g (39 percent of theory) of the title compound as a white powder melting at 193°-195° C.

Elemental Analysis C₁₆ H₂₃ N₃ O₂ S Calc.: %C, 57.0; %H, 6.87; %N, 12.5; %S, 9.50 Found: %C, 57.1; %H, 7.01; %N, 12.6; %S, 9.51

¹ H NMR (DMSO-d₆): 8.16 (S, 2H), 6.73 (s, 2H), 6.70 s, 1H), 6.57 (s, 1H), 6.18 (s, 2H), 2.48 (s, 6H), 2.45 (s, 3H), 2.19 (s, 3H), 2.14 (s, 3H).

6. Preparation of 2-Benzylthio-5,7-dimethyl[1,2,4]triazolo[1,5-a]pyridine

1,2-Diamino-4,6-dimethylpyridinium mesitylate (14.0 g, 0.041 mol) and 1,1'-thiocarbonyldiimidazole (7.4 g, 0.041 mol) were mixed in chloroform (100 mL) and heated at reflux for an hour. The solvent was removed by evaporation under reduced pressure and the residue was triturated with ether and ethyl acetate and filtered to obtain 6.8 g of 1,2-diamino-4,6-dimethylpyridinium mesitylate as an insoluble solid and a filtrate. The insoluble solid was combined with another 8.3 g (15.1 g total) of the same material and with 1,1'-thiocarbonyldiimidazole (10.0 g, 0.056 mol) and the resulting mixture was stirred at room temperature for 3 days. The solvent was removed by evaporation under reduced pressure and the residue was diluted with ether and tetrahydrofuran and the mixture was filtered to obtain a filtrate. The earlier ether and ethyl acetate filtrate plus this ether and tetrahydrofuran filtrate were combined and concentrated by evaporation under reduced pressure. The resulting residue was purified by medium pressure liquid chromatography on silica gel eluting with 15 percent ethyl acetate in hexane to obtain 3.5 g (20 percent of theory) of the title compound as a white powder melting at 69°-70° C.

¹ H NMR (CDCl₃): 7.1-7.5 (m, 6H), 6.5 (s, 1H), 4.5 (s, 2H), 2.6 (s, 3H), 2.4 (s, 3H); ¹³ C NMR (CDCl₃): 164.1, 151.8, 140.9, 137.6, 137.1, 129.1, 128.4, 127.2, 114.7, 111.2, 35.9, 21.5, 17.4.

Elemental Analysis C₁₅ H₁₅ N₃ S Calc.: %C, 66.9; %H, 5.61; %N, 15.6; %S, 11.9 Found: %C, 67.0; %H, 5.90; %N, 15.9; %S, 11.7

2-Benzylthio-7-methyl[1,2,4]triazolo[1,5-a]pyridine was prepared similarly from 1-((1-imidazolylthionyl)amino)-2-imino-4-methylpyridine. The product was a white powder melting at 81°-83° C.

¹ H NMR (CDCl₃): 8.28 (d, 1H, J=3.5), 7.23-7.46 (m, 6H), 6.67 (d, 1H, J=3.5), 4.48 (s, 2H), 2.40 (s, 3H); ¹³ C NMR (CDCl₃): 208.9, 164.9, 141.2, 137.2, 129.0, 128.5, 127.4, 126.7, 115.4, 113.9, 35.9, 21.5.

Elemental Analysis C₁₄ H₁₃ N₃ S Calc.: %C, 65.9; %H, 5.13; %N, 16.5; %S, 12.6 Found: %C, 65.8; %H, 5.43; %N, 16.5; %S, 12.3

7. Preparation of 2-Chlorosulfonyl-5,7-dimethyl[1,2,4]triazolo[1,5-a]pyridine

2-Benzylthio-5,7-dimethyl[1,2,4]triazolo[1,5-a]pyridine (3.3 g, 0.012 mol)was mixed with dichloromethane (50 mL) and water (50 mL) with good stirring. Chlorine (4.7 g, 0.066 mol) was added slowly at 3°-6° C. and the mixture allowed to react for another half hour. The organic layer was separated, dried over a mixture of magnesium and sodium sulfates, and concentrated by evaporation under reduced pressure. The residue was triturated with hexane and the resulting solids were recovered by filtration to obtain 2.7 g of the title compound as a white powder melting at 125°-126° C.

¹ H NMR (CDCl₃): 7.52 (s, 1H), 6.96 (s, 1H), 2.81 (s, 1H), 2.52 ( s, 1H).

2-Chlorosulfonyl-7-methyl[1,2,4]triazolo[1,5-a]pyridine was prepared by the same procedure. An 86 percent of theory yield of this material was obtained as a pale yellow powder melting at 142°-144° C.

¹ H NMR (CDCl₃): 8.57 (d, 1H, J=3.7), 7.66 (s, 1H), 7.14 (d, 1H, J=3.7), 2.57 (s, 3H).

2-Chlorosulfonyl-5-chloro-7-methyl[1,2,4]triazolo[1,5-a]pyridine was prepared similarly. A 91 percent of theory yield of this material was obtained as a pale yellow powder melting at 130°-132° C.

¹ H NMR (CDCl₃): 7.62 (s, 1H), 7.25 (s, 1H), 2.57 (s, 3H).

2-Chlorosulfonyl-5,7-dichloro[1,2,4]triazolo[1,5-a]pyridine was prepared similarly. A 100 percent yield of this compound was obtained as a pale yellow solid melting at 164°-166° C.

Elemental Analysis C₆ H₂ Cl₂ N₃ O₂ S Calc.: %C, 25.2; %H, 0.70; %N, 14.7; %S, 11.2 Found: %C, 25.2; %H, 0.65; %N, 14.4; %S, 10.9

2-Chlorosulfonyl-5-chloro[1,2,4]triazolo[1,5-a]pyridine was prepared similarly. An 80 percent yield of this compound was obtained as a brownish powder melting at 102°-103° C.

2-Chlorosulfonyl-5-bromo-1,2,4-triazolo[1,5-a]pyridine was prepared similarly. An 89 percent yield of this compound was obtained as a brown powder melting at 96°-97° C.

6-Bromo-2-chlorosulfonyl-8-methoxy[1,2,4]triazolo[1,5-a]pyridine was prepared similarly. An 85 percent yield of this compound was obtained as a yellow solid.

¹ H NMR (CDCl₃): 8.47 (s, 1H), 7.11 (s, 1H), 4.13 (s, 3H).

6-Chloro-2-chlorosulfonyl-8-methoxy[1,2,4]triazolo[1,5-a]pyridine was prepared similarly. An 84 percent yield of this compound was obtained as an orange gum.

¹ H NMR (CDCl₃): 8.38 (d, 1H, J=1.8), 7.00 (d, 1H, J=l.8), 4.13 (s, 3H).

8-Chloro-2-chlorosulfonyl-5-methoxy[1,2,4]triazolo[1,5-a]pyridine was prepared similarly. A 96 percent yield of this compound was obtained as a tan powder melting at 147°-149° C.

8-Bromo-2-chlorosulfonyl-5-methoxy[1,2,4]triazolo[1,5-a]pyridine was prepared similarly. A 90 percent yield of this compound was obtained as a tan powder melting at 120°-122° C. with decomposition.

7-Bromo-2-chlorosulfonyl-5-methoxy[1,2,4]triazolo[1,5-a]pyridine was prepared similarly. A 95 percent yield of this compound was obtained as a tan powder melting at 113 °-115° C.

8-Chloro-2-chlorosulfonyl[1,2,4]triazolo[1,5-a]pyridine was prepared similarly. An 84 percent yield of this compound was obtained as a pale yellow powder melting at 129°-131° C.

8. Preparation of 1,2-Diamino-4-methylpyridinium mesitylate

Ethyl O-mesitylenesulfonylacetohydroxamate (53.4 g, 0.191 mol) was dissolved in dioxane (300 mL) and cooled below 10° C. Perchloric acid (24.5 mL of 70 percent, 0.286 mol) was added dropwise with stirring. After 2 hours the solution was diluted with ice water and filtered to recover the solids. The damp solids were mixed with chloroform (300 mL) and the organic solution obtained was recovered and added to 2-amino-4-methylpyridine (19.6 g, 0.181 mol) in chloroform (300 mL) at 5°-10° C. The solution was warmed to room temperature for an hour. The solvent was then removed by evaporation under reduced pressure and the residue obtained was triturated with ether and then dichloromethane. The solids obtained were recovered by filtration to obtain 42.7 g (73 percent of theory) of the title compound as a white powder melting at 133°-136° C.

¹ H NMR (DMSO-d₆): 8.15 (s, 2H), 7.88 (d, 1H, J=3.4), 6.61-6.83 (m, 6H), 2.49 (s, 6H), 2.26 (s, 3H), 2.16 (s, 3H).

9. Preparation of 1-((1-Imidazolylthionyl)amino)-2-imino-4-methylpyridine

1,2-Diamino-4-methylpyridinium mesitylate (1.0 g, 0.0031 mol) and 1,1'-thiocarbonyldiimidazole (0.6 g, 0.0031 mol) were mixed in chloroform (25 mL) at room temperature. After a few hours the yellow color was gone and more 1,1'-thiocarbonyldiimidazole (0.6 g, 0.0031 mol) was added and the mixture was stirred overnight. The volatiles were removed by evaporation under reduced pressure and the residue obtained was triturated with ether. The resulting solids were purified by medium pressure liquid chromatography on silica gel eluting initially with 2 percent methanol in dichloromethane and gradually changing to 5 percent methanol in dichloromethane. The solvent was removed by evaporation under reduced pressure and the residue obtained was mixed with ether. The resulting solids were recovered by filtration to obtain 0.25 g (35 percent of theory) of the title compound as an off-white powder melting at 176°-177° C.

¹ H NMR (DMSO-d₆): 8.46 (s, 1H), 7.87 (s, 1H), 7.74 (d, 1H, J=3.4), 7.58 (broad s, 2H), 6.92 (s, 1H), 6.80 (s, 1H), 6.68 (dd, 1H, J=1.0, 3.4), 2.34 (s, 3H).

Elemental Analysis C₁₀ H₁₁ N₅ S Calc.: %C, 51.5; %H, 4.75; %N, 30.0; %S, 13.7 Found: %C, 51.4; %H, 4.85; %N, 30.2; %S, 13.7

1-((1-Imidazolylthionyl)amino)-2-imino-3,5-dibromopyridine was prepared in the same manner. The product was obtained in 96 percent yield as a pale yellow solid melting at 185°-186° C.

¹ H NMR (DMSO-d₆): 8.51 (d, 1H, J=1.8), 8.46 (s, 1H), 8.41 (d, 1H, J=2.1), 8.13 (brs, 2H), 7.86 (s, 1H), 6.93 (s, 1H).

1-((1-Imidazolylthionyl)amino)-2-imino-3,5-dichloropyridine was prepared in the same manner. The product was obtained in 86 percent yield as a pale yellow solid melting at 176°-178° C.

Elemental Analysis C₉ H₇ N₅ Cl₂ S Calc.: %C, 37.5; %H, 2.45; %N, 24.3; %S, 11.1 Found: %C, 37.7; %H, 2.50; %N, 24.0; %S, 11.2

¹ H NMR (DMSO-d₆): 8.48 (s, 1H), 8.39 (s, 1H), 8.38 (s, 1H), 8.29 (brs, 2H), 7.89 (s, 1H), 6.95 (s, 1H); ¹³ C NMR (DMSO-d₆): 181.1, 147.7, 138.7, 138.0, 136.4, 128.0, 120.5, 118.4, 117.8, 115.7.

10. Preparation of N-(2,6-Dichlorophenyl)-7-methyl[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamid

2-Chlorosulfonyl-7-methyl[1,2,4]triazolo[1,5-a]pyridine (1.2 g, 0.0052 mol), 2,6-dichloroaniline (1.7 g, 0.010 mol) and pyridine (0.40 g, 0.0052 mol) were dissolved in anhydrous acetonitrile (20 mL). Dimethyl sulfoxide (60 μL, 0.0008 mol) was added with stirring. The reaction was allowed to stir overnight. The volatiles were removed by evaporation under reduced pressure and the residue obtained was taken up in dichloromethane. The resulting mixture was washed well with dilute aqueous hydrochloric acid and the organic solution phase was recovered and concentrated by evaporation under reduced pressure. The resulting residue was triturated with hexane and the solids that formed were recovered by filtration and dried to obtain 0.7 g (38 percent of theory) of the title compound as a tan powder melting at 232°-234° C.

Elemental Analysis C₁₃ H₁₀ Cl₂ N₄ O₂ S Calc.: %C, 43.7; %H, 2.82; %N, 15.7; %S, 8.98 Found: %C, 44.0; %H, 2.87; %N, 15.5; %S, 9.15.

¹ H NMR (DMSO-d₆): 10.80 (s, 1H), 8.91 (d, 1H, J=3.5), 7.42 (s, 1H), 7.19-7.50 (m, 4H), 2.47 (s, 3H).

11. Preparation of 4-Methylglutaconic Anhydride

The procedure found in J. Am. Chem. Soc. 75, 2377-9 (1953) was generally followed. Ethyl isodehydroacetate (100 g, 0.51 mol) was added to a warm solution of sodium hydroxide (68.5 g., 0.71 mol) in water (500 mL) and stirred for an hour until the mixture became clear. The solution was acidified with concentrated hydrochloric acid (200 mL) and was extracted with ethyl acetate. The extract was dried over magnesium sulfate and concentrated by evaporation under reduced pressure. The residue was mixed with acetic anhydride (250 mL) and the resulting mixture was heated at reflux for 20-30 min. The solvent was removed by evaporation under reduced pressure and the residue obtained was crystallized from ether to obtain 60.8 g (94 percent of theory) of the title compound as a tan powder melting at 70°-72° C.

¹ H NMR (CDCl₃): 6.01 (s, 1H), 3.41 (s, 2H), 2.04 (s) 3H).

The reaction works equally with methyl rather than ethyl isodehydroacetate. Acetylchloride can be used instead of acetic anhydride, but acetic anhydride typically gave better results.

12. Preparation of 2-Benzylthio-5-hydroxy-7-methyl[1,2,4]triazolo[1,5-a]pyridine

A mixture of thiosemicarbazide (50.0 g, 0.554 mol) and benzyl chloride (67.1 g, 0.53 mol) in 2-propanol (1 L) was heated to reflux with stirring for 2 hours. The reaction mixture was then cooled and 4-methylglutaconic anhydride (60.8 g, 0.482 mol) and triethylamine (75 mL, 53.6 g, 0.53 mol) were added. The reaction mixture was again heated at reflux with stirring for an hour. Sodium methoxide in methanol solution (250 mL of 25 percent, 1.09 mol) was then added and the yellow-brown mixture obtained was heated at reflux with stirring for 2.5 hours. The volatiles were removed by evaporation under reduced pressure and the residue obtained was combined with dilute aqueous acetic acid (150 mL) and ethyl acetate. The organic phase was recovered, washed well with water and concentrated by evaporation under reduced pressure. The residue obtained was heated with a heat gun under reduced pressure for 30 minutes until the bubbling had stopped and the reaction mixture had solidified. The mixture was cooled and diluted with methanol and the resulting solids were recovered by filtration to obtain 54.5 g (41 percent of theory) of the title compound as a yellow-brown powder melting at 214°-216° C.

Elemental Analysis C₁₃ H₁₁ ClN₄ S Calc.: %C, 62.0; %H, 4.83; %N, 15.5; %S, 11.9 Found: %C, 61.9; %H, 4.88; %N, 15.5; %S, 11.5

13. Preparation of 2-Benzylthio-5-chloro-7-methyl[1,2,4]triazolo[1,5-a]pyridine

N,N-Dimethylaniline (21,9 g, 0.18 mol) was added slowly to a mixture of 2-benzylthio-5-hydroxyl7-methyl[1,2,4]triazolo[1,5-a]pyridine (44.5 g, 0.164 mol) in 150 mL of phosphorus oxychloride with stirring. The mixture was heated at reflux with stirring for 20 hours. The excess phosphorus oxychloride was then removed by evaporation under reduced pressure. The residue obtained was dissolved in ethyl acetate, washed well with water and quickly concentrated by evaporation under reduced pressure to drive off the excess water. The residue was again dissolved in ethyl acetate and the resulting mixture was filtered with suction through a bed of silica gel. The filtrate was concentrated by evaporation under reduced pressure and the residue obtained was mixed with hexane. The resulting mixture was filtered to recover the solids and dried to obtain the 37.5 g. (79 percent of theory) of the title compound as a tan powder melting at 108°-110° C.

Elemental Analysis C₁₄ H₁₂ ClN₃ S Calc.: %C, 58.0; %H, 4.17; %N, 14.5; %S, 11.1 Found: %C, 58.4; %H, 3.93; %N, 14.6; %S, 11.0

¹ H NMR (CDCl₃): 7.20-7.52 (m, 6H), 6.86 (s, 1H), 4.51 (s, 2H), 2.44 (s, 3H); ¹³ C NMR (CDCl₃): 165.4, 152.5, 141.7, 131.2, 129.1, 128.4, 128.1, 127.3, 115.2, 112.2, 35.8, 21.4.

14. Preparation of 2-Benzylthio-5-methoxy-7-methyl[1,2,4]triazolo[1,5-a]pyridine

A mixture of 2-benzylthio-5-chloro-7-methyl[1,2,4]triazolo[1,5-a]pyridine (5.0 g, 0.017 mol), sodium methoxide in methanol (16 mL of 25 percent, 3.7 g, 0.070 mol) and methanol (100 mL) were heated at reflux with stirring for 4 hours. The reaction mixture was then cooled, acidified with acetic acid (10 mL), and concentrated by evaporation under reduced pressure. The residue obtained was dissolved in dichloromethane and the resulting solution was washed well with water, dried over magnesium sulfate, and concentrated by evaporation under reduced pressure. The residue obtained was mixed with hexane and filtered to recover the solids. The solids were dried to obtain 4.7 g (97 percent of theory) of the title compound as a tan powder melting at 85°-87° C.

¹ H NMR (CDCl₃): 7.24-7.46 (m, 5H), 7.02 (s, 1H), 6.06 (s, 1H), 4.51 (s, 2H), 4.10 (s, 3H), 2.43 (s, 3H).

Elemental Analysis C₁₅ H₁₅ N₃ OS Calc.: %C, 63.1; %H, 5.30; %N, 14.7; %S, 11.2 Found: %C, 62.9; %H, 5.12; %N, 14.7; %S, 11.3

15. Preparation of N-(2,6-Dichlorophenyl)-5-chloro-7-methyl[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide

The title compound was prepared from 2-chlorosulfonyl-5-chloro-7-methyl[1,2,4]triazolo[1,5-a]pyridine using the procedure of Example 10. The white solid compound, which was obtained in 62 percent yield, had a melting point of 257°-258° C.

Elemental Analysis C₁₃ H₉ Cl₃ N₄ O₂ S Calc.: %C, 39.9; %H, 2.32; %N, 14.3; %S, 8.19 Found: %C, 39.8; %H, 2.35; %N, 14.3; %S, 8.03

¹ H NMR (DMSO-d₆): 10.80 (s, 1H), 7.81 (s, 1H), 7.60 (s, 1H), 7.03-7.48 (m, 3H), 2.48 (s, 3H).

16. Preparation of N-(2,6-Dichlorophenyl)-5-methoxy-7-methyl[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide

N-(2,6-Dichlorophenyl)-5-chloro-7-methyl[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide (3.0 g, 0.0077 mol) and 25 percent sodium methoxide in methanol (12 mL, 2.8 g, 0.050 mol) were combined in methanol (100 mL) and heated to reflux with stirring for 2 hours. The reaction mixture was cooled and acidified with acetic acid and the volatiles were removed by evaporation under reduced pressure. The residue obtained was diluted with dichloromethane and the mixture was washed with water. The organic solution phase was filtered and the filtrate was concentrated by evaporation under reduced pressure. The residue obtained was mixed with ether and filtered to recover the solids. The solids were dried to obtain 2.6 g (87 percent of theory) of the title compound as a white powder melting at 269°-270° C.(d).

Elemental Analysis C₁₄ H₁₂ Cl₂ N₄ O₃ S Calc.: %C, 43.4; %H, 3.13; %N, 14.5; %S, 8.27 Found: %C, 43.3; %H, 3.13; %N, 14.4; %S, 8.18

¹ H NMR (DMSO-d₆): 10.79 (s, 1H), 7.28-7.50 (m, 4H), 6.72 (s, 1H), 4.12 (s, 3H), 2.47 (s, 3H).

N-(2,6-Difluorophenyl)-5-methoxy-7-methyl[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide was prepared by the same procedure from N-(2,6-difluorophenyl)-5-chloro-7-methyl[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide. The product was obtained as a light tan powder melting at 248°-249° C.

Elemental Analysis C₁₄ H₁₂ F₂ N₄ O₃ S Calc.: %C, 47.6; %H, 3.41; %N, 15.8; %S, 9.05 Found: %C, 47.4; %H, 3.48; %N, 15.8; %S, 9.05

¹ H NMR (DMSO-d₆): 10.66 (s, 1H), 7.02-7.46 (m, 4H), 6.73 (s, 1H), 4.12 (s, 3H), 2.47 (s, 3H).

17. Preparation of 2-Hydrazino-3-nitropyridine

2-Chloro-3-nitropyridine (100 g, 0.63 mol), hydrazine monohydrate (70.4 mL, 72.6 g, 1.45 mol) and methanol (1.3 L) were mixed and heated to reflux with stirring. After 30 min the reaction mixture was cooled and filtered collecting the insoluble materials. The filtrate was concentrated by evaporation under reduced pressure and the residue obtained as well as the insoluble materials from the filtration were diluted with water. The insoluble solids present were collected by filtration, washed with water, and dried to obtain 95.2 g (98 percent of theory) of the title compound as a bright yellow powder melting at 168°-169° C.

Elemental Analysis C₅ H₆ N₄ O₂ Calc.: %C, 39.0; %H, 3.90; %N, 36.4; %S, 8.27 Found: %C, 39.1; %H, 4.17; %N, 36.1; %S, 8.18

18. Preparation of 2-Benzylthio-8-nitro[1,2,4]triazolo[1,5-a]pyridine

2-Hydrazino-3-nitropyridine (95.2 g, 0.618 mol) was combined with acetonitrile (1 L) and carbon disulfide (114 mL, 143.9 g, 1.89 mol) was added. The resulting mixture was stirred for 1.5 hours. Hydrogen peroxide (78.6 mL of 30 percent aqueous solution, 23.6 g, 0.693 mol) was added dropwise over a 20-min period with cooling at 15°-20° C. The mixture was stirred for another 2 hours and was then cooled in an ice bath. Benzyl chloride (91.7 g, 0.72 mol) was added and then triethylamine (110 mL, 79.6 g, 0.79 mol) was added slowly with stirring over a 2-hour period. The reaction was exothermic. The mixture was stirred at room temperature over the weekend. The volatiles were removed by evaporation under reduced pressure and the residue obtained was diluted with dichloromethane and water. The resulting mixture was filtered through Celite® to remove the precipitated sulfur. The organic phase of the filtrate was recovered, washed with water, and concentrated by evaporation under reduced pressure. The solid residue obtained was diluted with hexane, recovered by filtration, and dried to obtain 174.0 g (98 percent of theory) of the title compound as a brown powder melting at 125°-126° C.(d).

Elemental Analysis C₁₃ H₁₀ N₄ O₂ S Calc.: %C, 54.5; %H, 3.52; %N, 19.6; %S, 11.2 Found: %C, 54.8; %H, 3.64; %N, 19.7; %S, 11.3

19. Preparation of 8-Amino-2-benzylthio[1,2,4]triazolo[1,5-a]pyridine

2-Benzylthio-8-nitro[1,2,4]triazolo[1,5-a]pyridine (174.0 g, 0.61 mol), iron filings (204.2 g., 3.65 mol) and acetic acid (2 L) were combined and heated with stirring at 70°-80° C. for 6 hours. The reaction mixture was cooled and diluted with water and dichloromethane. The resulting mixture was filtered through Celite®, the liquid phases in the filtrate were separated, and the aqueous layer was extracted with a little more dichloromethane. The organic phase and extract were combined and washed several times with water and then with dilute aqueous sodium hydroxide. The resulting organic solution was concentrated by evaporation under reduced pressure and the residue obtained was mixed with ether. The insoluble solids were collected by filtration and dried to obtain 106.3 g of the title compound as a brown powder melting at 116°-117° C. An additional 14.2 g of lower purity product was isolated from the ether filtrate (77 percent of theory total yield). This reduction was also carried out with iron powder and calcium chloride in aqueous ethanol and with stannous chloride in hydrochloric acid.

20. Preparation of 8-Amino-2-benzylthio-5,7-dichloro[1,2,4]triazolo[1,5-a]pyridine

8-Amino-2-benzylthio[1,2,4]triazolo[1,5-a]pyridine (20.0 g, 0.078 mol), N-chlorosuccinimide (10.4 g, 0.078 mol) and carbon tetrachloride were combined and heated to reflux with stirring for 1 hour. The reaction mixture was cooled, more N-chlorosuccinimide (10.4 g) was added, and the reaction heated to reflux with stirring for another hour. The reaction mixture was then cooled and filtered. The filtrate was concentrated by evaporation under reduced pressure and the residue obtained was purified by column chromatography on silica gel eluting with dichloromethane. The product fractions were concentrated by evaporation under reduced pressure and the residues were combined and mixed with ether. The insoluble solids were collected by filtration and dried to obtain 18.0 g (71 percent of theory) of the title compound as a light tan powder melting at 118°-119° C.

21. Preparation of 2-Benzylthio-5,7-dichloro[1,2,4]triazolo[1,5-a]pyridine

8-Amino-2-benzylthio-5,7-dichloro[1,2,4]triazolo[1,5-a]pyridine (25.8 g, 0.079 mol), t-butyl nitrite (18.9 mL, 16.4 g, 0.158 mol) and tetrahydrofuran (1.5 L) were combined and heated at reflux with stirring. Gas evolution began immediately and stopped after a few minutes, but the reaction was heated at reflux for an hour. The volatiles were removed by evaporation under reduced pressure and the residue obtained was chromatographed on silica gel eluting with dichloromethane. The product fractions were concentrated by evaporation under reduced pressure and the residue obtained was mixed with ether. The insoluble solid material was collected by filtration. The ether filtrate was concentrated by evaporation under reduced pressure and the residue was rechromatographed on silica gel eluting with 10 percent ethyl acetate in hexane. The product fractions were concentrated by evaporation under reduced pressure and the residue obtained was combined with the insoluble solid material obtained before to obtain 12.2 g (50 percent of theory) of the title compound as a red-brown powder melting at 88°-89° C.

Elemental Analysis C₁₃ H₉ Cl₂ N₃ S Calc: %C, 50.3; %H, 2.92; %N, 13.6; %S, 10.3 Found: %C, 50.1; %H, 2.92; %N, 13.6; %S, 10.2

2-Benzylthio-5,7-dibromo[1,2,4]triazolo[1,5-a]pyridine was prepared similarly from 8-amino-2-benzylthio-5,7-dibromo[1,2,4]triazolo[1,5-a]pyridine. A 32 percent yield of this compound was obtained as a light tan powder melting at 113°-114° C.

22. Preparation of N-(2,6-Dichlorophenyl)-5-methoxy-7-chloro[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide

Sodium methoxide in methanol (1.1 mL of 25 percent solution, 0.26 g, 0.005 mol) was added to a solution of N-(2,6-dichlorophenyl)-5,7-dichloro[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide (0.9 g, 0.02 mol) in dimethyl sulfoxide (30 mL) at ambient temperature with stirring. The reaction was complete in a few minutes, but was stirred for 30 min. The mixture was then acidified with acetic acid and diluted with dichloromethane. The resulting organic phase was recovered and washed with water and the volatiles were removed by evaporation under reduced pressure. The residue obtained was mixed with hexane and the insoluble solids were collected by filtration and dried to obtain 0.8 g (90 percent of theory) of the title compound as a light tan powder melting at 232°-234° C.(d).

Elemental Analysis C₁₃ H₉ Cl₃ N₄ O₃ S Calc.: %C, 38.3; %H, 2.22; %N, 13.7; %S, 7.87 Found: %C, 38.3; %H, 2.12; %N, 13.7; %S, 7.63

23. Preparation of N-(2,6-Dichlorophenyl)-5,7-dimethoxy[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide

Sodium methoxide in methanol (3.0 mL of 25 percent solution, 0.71 g, 0.013 mol) was added to a solution of N-(2,6-dichlorophenyl)-5-methoxy-7-chloro[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide (0.66 g, 0.0016 mol) in dimethyl sulfoxide (30 mL) with stirring over several hours. The mixture was allowed to react and was then acidified with acetic acid and diluted with dichloromethane. The resulting organic phase was recovered and washed with water and the volatiles were removed by evaporation under reduced pressure. The residue obtained was chromatographed on silica gel starting with 0.5 percent acetic acid in dichloromethane and gradually increasing the strength to 0.5 percent acetic acid plus 1.0 percent ethanol in dichloromethane. The product fractions were concentrated by evaporation under reduced pressure to obtain 118 mg (13 percent of theory) of the title compound as a pale yellow powder melting at 252°-253° C.(d).

Elemental Analysis C₁₄ H₁₂ Cl₂ N₄ O₄ S Calc.: %C, 41.7; %H, 3.00; %N, 13.9; %S, 7.95 Found: %C, 41.8; %H, 2.67; %N, 13.6; %S, 8.00

24. Preparation of N-(2-fluoro-5-methyl-3-pyridinyl)-5-methoxy-7-methyl[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide

To a solution of 0.70 g (1.9 mmol) of N-(2-fluoro-5-methyl-3-pyridinyl)-5-chloro-7-methyl[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide in 25 mL of dry dimethyl sulfoxide was added with stirring 1.0 mL (4.6 mmol) of sodium methoxide as a 25 percent solution in methanol. After 3 min, 3 mL of acetic acid was added and the solution was diluted with 600 mL of dichloromethane. The resulting solution was washed with water (5×100 mL), dried over magnesium sulfate, filtered, and concentrated by evaporation under reduced pressure to obtain 0.5 g (71 percent of theory) of the title compound as a white solid melting at 262°-264° C. with decomposition.

Elemental Analysis C₁₃ H₁₁ ClFN₅ O₃ S Calc.: %C, 42.0; %H, 2.98; %N, 18.8; %S, 8.62 Found: %C, 41.9; %H, 2.93; %N, 18.8; %S, 8.47

¹ H NMR (DMSO-d₆): 10.7 (br, 1H), 8.1 (dd, 1H), 8.05 (dd, H), 7.4 (s, 1H), 6.8 (s, 1H), 4.1 (s, 1H), 2.5 (s, 3H).

25. Preparation of 8-Amino-2-benzylthio-5-chloro[1,2,4]triazolo[1,5-a]pyridine

A solution of 8-amino-2-benzylthio[1,2,4]triazolo[1,5-a]pyridine (14.0 g, 0.0546 mol) and 1,3-dichloro-5,5-dimethylhydantoin (5.4 g, 0.0273 mol) were combined in 500 mL of dichloromethane and the mixture was heated at reflux with stirring for two hours. Additional 1,3-dichloro-5,5-dimethylhydantoin (5.0 g, 0.025 mol) was added and the reaction was ]heated with stirring for an additional hour. The reaction mixture was cooled and dilute aqueous sodium bisulfite was added with stirring and allowed to react for an hour. The mixture was then washed with water and the volatiles were removed by evaporation under reduced pressure. The residue obtained was chromatographed on silica gel eluting with dichloromethane to obtain 6.0 g (38 percent of theory) of the title compound as a light tan powder melting at 113°-114° C.

Elemental Analysis C₁₃ H₁₁ ClN₄ S Calc.: %C, 53.7; %H, 3.81; %N, 19.3; %S, 11.0 Found: %C, 53.9; %H, 3.84; %N, 19.5; %S, 11.0

26. Preparation of 2-Benzylthio-5-chloro[1,2,4]triazolo[1,5-a]pyridine

A solution of 8-amino-2-benzylthio-5-chloro[1,2,4]triazolo[1,5-a]pyridine (9.0 g, 0.031 mol) and acetic acid (2.0 g, 0.033 mol) in tetrahydrofuran (100 mL) was added dropwise with stirring over 30 min to a solution of t-butyl nitrite (6.4 g, i0.062 mol) in tetrahydrofuran (500 mL) at 50°-55° C. and allowed to react another 15 minutes after the addition was complete. The volatiles were removed by evaporation under reduced pressure and the residue obtained was chromatographed on silica gel eluting with a gradient of 5-15 percent ethyl acetate in hexane. The product fractions were concentrated by evaporation under reduced pressure to obtain 3.4 g (37 percent of theory) of the title compound as a dark low-melting solid.

27. Preparation of 8-Amino-2-benzylthio-5-bromo[1,2,4]triazolo[1,5-a]pyridine

8-Amino-2-benzylthio[1,2,4]triazolo[1,5-a]pyridine (25.6 g, 0.1 mol), N-bromosuccinimide (17.8 g, 0.1 mol) and 2 L of dichloromethane were combined with stirring for an hour. The solution was washed with dilute aqueous sodium bisulfite and then with water and the volatiles were removed by evaporation under reduced pressure. The residue obtained was chromatographed on silica gel eluting with 25 percent ethyl acetate in hexane. The product fractions were concentrated by evaporation under reduced pressure and the solid residue obtained was extracted with ether and dried to obtain 17.5 g (52 percent of theory) of the title compound as a light tan powder melting at 125°-126° C.

Elemental Analysis C₁₃ H₁₁ BrN₄ S Calc.: %C, 46.6; %H, 3.31; %N, 16.7; %S, 9.56 Found: %C, 46.7; %H, 3.34; %N, 17.0; %S, 9.56

28. Preparation of 8-Amine-2-benzylthio-5-Chloro[1,2,4]triazolo[1,5-a]pyridine by Reduction

A mixture of 1.0 g (3.5 mmol) of 2-benzylthio-8-nitro[1,2,4]triazolo[1,5-a]pyridine, 1.35 g (3.85 mmol) of stannic chloride pentahydrate, and 10mL of concentrated hydrochloric acid was prepared and heated to 90° C. with stirring. A solution of 1.99 g (10.5 mmol) of stannous chloride in 10 mL of concentrated aqueous hydrochloric acid was added slowly over a 1-hour period. After a short reaction period the mixture was allowed to cool and the solids present were collected by filtration. The collected solids were placed in water and the mixture was basified with dilute aqueous sodium hydroxide. The resulting mixture was extracted with dichloromethane and the organic extract was concentrated by evaporation under reduced pressure to obtain 0.60 g (66 percent of theory) of product as a brown solid. This solid was found to be 93 percent the title compound and 7 percent 8-amino-2-benzylthio[1,2,4]triazolo[1,5-a]pyridine by high pressure liquid chromatography. The pure compound melts at 113°-114° C.

29. Preparation of 8-Amino-2-benzylthio-5-ethoxy[1,2,4]triazolo[1,5-a]pyridine by Reduction

2-Benzylthio-8-nitro[1,2,4]triazolo[1,5-a]pyridine (5.0 g, 0.017 mol) and stannic chloride pentahydrate (7.3 g, 0.021 mol) were mixed with 100 mL of ethanol and the mixture was heated to reflux with stirring. A solution of stannous chloride (13.2 g, 0.07 mol) in 100 mL of ethanol was added dropwise with stirring over 45 minutes and the heating was continued another 20 minutes after the addition was complete. The reaction mixture was diluted with dichloromethane. The resulting mixture was washed well with 2N aqueous hydrochloric acid and was then concentrated by evaporation under reduced pressure. The residue was chromatographed on silica gel eluting first with 5 percent ethyl acetate in dichloromethane and gradually increasing to 20 percent ethyl acetate in dichloromethane,. The product fractions were concentrated by evaporation under reduced pressure and the residue was dissolved in dichloromethane. The resulting solution was washed well with 2N aqueous sodium hydroxide, dried over magnesium sulfate, and concentrated by evaporation under reduced pressure. The residue was mixed with hexane and the insoluble solids were recovered by filtration and dried to obtain 1.7 g (33 percent of theory) of the title compound as a dark tan powder melting at 106°-107° C.

Elemental Analysis C₁₅ H₁₆ N₄ OS Calc.: %C, 60.0; %H, 5.37; %N, 18.7; %S, 10.7 Found: %C, 59.8; %H, 5.49; %N, 18.8; %S, 10.5

30. Preparation of 1,2-Diamino-3,5-dichloropyridinium Mesitylate

2-Amino-3,5-dichloropyridine (9.48 g, 58.1 mmol) was dissolved in chloroform (100 mL) in a round bottom flask and the mixture was cooled to 5° C. in an ice bath. To this mixture was added dropwise with stirring a freshly prepared solution of O-mesitylenesulfonylhydoxylamine (15.5 g, 69.8 mmol) in chloroform. (warning; this compound is an explosive solid). A thick white precipitate began to form after 15 min. The mixture was allowed to warm to room temperature while stirring overnight. The solids present were recovered by filtration, washed with chloroform (3×100 mL), and dried to obtain 17.5 g (80 percent of theory) of the title compound as a white crystalline solid melting at 231°-232° C.

Infrared Analysis (KBr): 3407, 3203, 3025, 2936, 1656, 1369, 1182, 1086, 1014, 679, 600, 548 cm⁻¹ ;

¹ H NMR (DMSO-d₆): 8.81 (s, 2H), 8.42 (s, 2H), 7.01 (s, 2H), 6.73 (s, 2H), 2.50 (s, >6H), 2.16 (s, 3H).

1,2-Diamino-3,5-dibromopyridinium mesitylate was prepared similarly and was obtained in 92 percent yield as an off-white solid melting at 212°-213° C.

¹ H NMR (DMSO-d₆): 8.67 (brs, 2H), 8.58 (d, 1H, J=2.1), 8.47 (d, 1H, J=2.1), 6.99 (s, 2H), 6.74 (s, 2H), 2.49 (s, >6H), 2.17 (s, 3H).

Elemental Analysis C₁₄ H₁₇ Br₂ N₃ O₃ S Calc.: %C, 36.1; %H, 3.68; %N, 9.01; %S, 6.88 Found: %C, 35.9; %H, 3.98; %N, 8.89; %S, 6.86

31. Preparation of 2-Benzylthio-6,8-dichloro[1,2,4]triazolo[1,5-a]pyridine

1-((1-Imidazolylthionyl)amino)-2-imino-3,5-dichloropyridine (1.0 g, 3.5 mmol) was combined with n-butanol (10 mL) in a round bottom flask and heated to 100° C. with stirring. Benzyl chloride (0.48 mL, 4.2 mmol) was added and the mixture was heated at reflux with stirring for 1.5 hour. The volatiles were then removed by evaporation under reduced pressure and the solid residue obtained was triturated with hexane (20 mL), water (20 mL), and hexane (20 mL). The resulting solid was washed with hexane on a filter and dried to obtain 0.80 g (74 percent of theory) of the title compound as a pale yellow solid melting at 115°-116° C.

Elemental Analysis C₁₃ H₉ N₃ Cl₂ S Calc.: %C, 50.3; %H, 2.92; %N, 13.6; %S, 10.3 Found: %C, 49.4; %H, 2.32; %N, 13.8; %S, 10.1

¹ H NMR (DMSO-d₆): 9.28 (s, 1H), 8.08 (s, 1H), 7.46 (d, 2H, J=7.2), 7.27-7.31 (m, 3H), 4.50 (s, 2H); ¹³ C NMR (DMSO-d₆): 164.9, 148.2, 137.2, 130.5, 128.9, 128.5, 127.4, 126.5, 119.7, 119.4, 34.7.

2-Benzylthio-6,8-dibromo[1,2,4]triazolo[1,5-a]pyridine was prepared similarly. The product was obtained in 84 percent yield as a pale yellow solid melting at 123°-124° C.

Elemental Analysis C₁₃ H₉ N₃ Br₂ S Calc.: %C, 39.1; %H, 2.27; %N, 10.5; %S, 8.03 Found: %C, 38.8; %H, 2.34; %N, 10.6; %S, 8.17

¹ H NMR (DMSO-d₆): 9.34 (d, 1H, J=1.8), 8.23 (d, 1H, J=1.5), 7.47 (d, 2H, J=6.9), 7.25-7.33 (m, 3H), 4.49 (s, 2H).

32. Preparation of 2-Benzylthio-6-bromo-8-methoxy[1,2,4]triazolo[1,5-a]pyridine

2-Benzylthio-6,8-dibromo[1,2,4]triazolo[1,5-a]pyridine (9.5 g, 23.28 mmol) was mixed with acetonitrile (50 mL) in a round bottom flask. Sodium methoxide (13.1 mL of 25 percent solution in methanol, 57.1 mmol) was added and the mixture was heated at reflux for 2 hours. Glacial acetic acid (10 mL) was added and the entire reaction mixture was poured into a mixture of ice and water (300 mL). The brown precipitate that formed was recovered by filtration and dried. This was chromatographed on silica gel eluting with a 1:1 mixture of ethyl acetate and hexane. Product-containing fractions were combined and concentrated under reduced pressure to obtain 6.58 g (80 percent of theory) of the title compound as a pale yellow solid.

Elemental Analysis C₁₄ H₁₂ N₃ BrSO Calc.: %C, 48.0; %H, 3.45; %N, 12.0; %S, 9.75 Found: %C, 47.8; %H, 3.36; %N, 11.9; %S, 9.22

¹ H NMR (DMSO-d₆): 8.85 (d, 1H, J=1.5), 7.42 (d, 2H, J=7.5), 7.23-7.31 (m, 4H), 4.46 (s, 2H), 3.97 (s, 3H).

2-Benzylthio-6-chloro-8-methoxy[1,2,4]triazolo[1,5-a]pyridine was prepared similarly. The product was obtained in 87 percent yield as a tan solid melting at 125°-126° C.

¹ H NMR (DMSO-d₆): 8.84 (d, 1H, J=1.5), 7.46 (d, 2H, J=6.9), 7.26-7.36 (m, 3H), 7.24 (d, 1H, J=1.5), 4.50 (s, 2H), 4.02 (s, 3H).

2-Benzylthio-6-chloro-8-ethoxy[1,2,4]triazolo[1,5-a]pyridine was prepared similarly. The product was obtained in 100 percent yield as a pale orange oil.

¹ H NMR (DMSO-d₆): 8.83 (d, 1H, J=1.2), 7.45 (d, 2H, J=7.2), 7.26-7.34 (m, 3H), 7.22 (d, 9H, J=1.2), 1H), 4.49 (s, 2H), 4.28 (q, 2H, J=7.2), 1.41 (t, 3H, J=6.9).

33. Preparation of 6-Bromo-5-chloro-2-chlorosulfonyl-8-methoxy[1,2,4]triazolo[1,5-a]pyridine

2-Benzylthio-6-bromo-8-methoxy[1,2,4]triazolo[1,5-a]pyridine (2.0 g, 5.7 mmol) was dissolved in dichloromethane (30 mL) in a three-necked flask equipped with high-speed stirrer and a dry ice condenser and was cooled in an ice bath to 5° C. Aqueous hydrochloric acid (2N, 30 mL, 60 mmol) and then sodium hypochlorite (5 percent aqueous solution, 50 mL, 34 mmol) were added with stirring. The mixture was allowed to react for 2 hours. The layers were then separated and the aqueous layer was washed with dichloromethane (2×10 mL). The dichloromethane layer and wash were combined, washed with water (20mL) and saturated aqueous sodium chloride solution (20 mL), and concentrated by evaporation under reduced pressure to obtain a gum. This was triturated with hexane to obtain 1.94 g (97 percent of theory) of the title compound as a yellow gum.

¹ H NMR (CDCl₃): 7.14 (s, 1H); 4.13 (s, 3H).

34. Preparation of 2-Benzylthio-5,8-dichloro[1,2,4]triazolo[1,5-a]pyridine

A mixture of 9.9 g (0.10 mol) of copper (I) chloride with 300 mL of acetonitrile was prepared and 8.7 mL (6.8 g, 0.066 mol) of 90 percent t-butyl nitrite was added with stirring. After 10 minutes 9.5 g (0.033 mol) of 8-amino-2-benzylthio-5-chloro[1,2,4]triazolo[1,5-a]pyridine was added and the reaction mixture was allowed to react with stirring for 3 days. The mixture was then diluted with dichloromethane and 2N aqueous hydrochloric acid, and after mixing this well, the phases were separated. The organic layer was washed with 2N aqueous hydrochloric acid and concentrated by evaporation under reduced pressure. The residue was chromatographed on silica gel eluting with dichloromethane to obtain 6.5 g (63 percent of theory) of the title compound as a yellow powder melting at 103°-104° C.

Elemental Analysis C₁₃ H₉ Cl₂ N₃ S Calc.: %C, 50.3; %H, 2.92; %N, 13.6; %S, 10.3 Found: %C, 50.4; %H, 3.08; %N, 13.6; %S, 10.3

2-Benzylthio-8-chloro[1,2,4]triazolo[1,5-a]pyridine was prepared similarly from 8-amino-2-benzylthio[1,2,4]triazolo[1,5-a]pyridine. A 65 percent yield of this compound was obtained as a yellow powder melting at 82°-83° C.

Elemental Analysis C₁₃ H₁₀ ClN₃ S Calc.: %C, 56.6; %H, 3.66; %N, 15.2; %S, 11.6 Found: %C, 56.6; %H, 3.33; %N, 15.3; %S, 11.5

35. Preparation of 2-Benzylthio-8-chloro-5-methoxy[1,2,4]triazolo[1,5-a]pyridine

2-Benzylthio-5,8-dichloro[1,2,4]triazolo[1,5-a]pyridine (6.0 g, 0.019 mol) and 25 percent sodium methoxide in methanol (26.5 mL, 6.3 g, 0.116 mol) were combined in methanol and the mixture was heated to reflux for 2 hours. The mixture was then cooled, acidified with acetic acid, and concentrated by evaporation under reduced pressure. The residue was dissolved in dichloromethane and the solution was washed with water and concentrated by evaporation under reduced pressure. The residue was triturated with hexane and the resulting solids were collected by filtration and dried to obtain 5.76 g 99 percent of theory) of the title compound as a light tan powder melting at 90°-91° C.

Elemental Analysis C₁₄ H₁₂ ClN₃ OS Calc.: %C, 55.0; %H, 3.96; %N, 13.7; %S, 10.5 Found: %C, 54.9;%H, 4.02; %N, 13.4; %S, 10.7

36. Preparation of 2-Benzylthio-8-bromo-5-chloro[1,2,4]triazolo[1,5-a]pyridine

Copper (I) bromide (4.9 g., 0.0034 mol) was combined with 200 mL of acetonitrile for 15 minutes and then 3.0 mL (2.3 g, 0.0023 mol) of 90 percent t-butyl nitrite was added and the mixture was stirred for a few minutes. 8-Amino-2-benzylthio-5-chloro[1,2,4]triazolo[1,5-a]pyridine (3.3 g, 0.0013 mol) was then added and the resulting mixture was stirred for 2 days. The resulting mixture was concentrated by evaporation under reduced pressure and the residue was chromatographed on silica gel eluting with dichloromethane. After the solvent of the product fractions was removed by evaporation under reduced pressure, the residue was mixed with hexane and the solid material was recovered by filtration and dried to obtain 2.6 g (56 percent of theory) of the title compound as a yellow powder melting at 122°-124° C.

Elemental Analysis C₁₃ H₉ BrClN₃ S Calc.: %C, 44.0; %H, 2.56; %N, 11.9; %S, 9.04 Found: %C, 43.9; %H, 2.59; %N, 11.9; %S, 8.86

37. Preparation of 2-Benzylthio-8-bromo-5-methoxy[1,2,4]triazolo[1,5-a]pyridine

2-Benzylthio-8-bromo-5-chloro[1,2,4]triazolo[1,5-a]pyridine (7.7 g, 0.0217 mol) and 25 percent sodium methoxide in methanol (19.9 mL, 4.7 g, 0.0868 mol) were mixed with 400 mL of methanol and the mixture was heated to reflux for 1.5 hours. It was then cooled and acidified with acetic acid. The volatiles were removed by evaporation under reduced pressure and the residue was dissolved in dichloromethane. The resulting solution was washed with water and concentrated by evaporation under reduced pressure. The resulting residue was triturated with hexane and the solids obtained were recovered by filtration and dried to obtain 7.3 g (96 percent of theory) of the title compound as a light tan powder melting at 78°-79° C.

Elemental Analysis C₁₄ H₁₂ BrN₃ OS Calc.: %C, 48.0; %H, 3.45; %N, 12.0; %S, 9.16 Found: %C, 48.0; %H, 3.52; %N, 12.2; %S, 9.01

38. Preparation of N-(2,6-Difluorophenyl)-8-methoxy[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide

N-(2,6-Difluorophenyl)-8-chloro[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide (0.8 g, 0. 0023 mol) and 25 percent sodium methoxide in methanol (1.6 mL, 0.37 g, 0.007 mol) were combined with 20 mL of dimethyl sulfoxide and the resulting solution was stirred at ambient temperature overnight. Another 1.6 mL of 25 percent sodium methoxide in methanol was added and the reaction mixture was stirred another 3 days. The mixture was then acidified with acetic acid and diluted with dichloromethane. The resulting solution was washed well with water and concentrated by evaporation under reduced pressure. The residue, which appeared to contain considerable starting material, was dissolved in 20 mL of dimethyl sulfoxide and potassium methoxide (0.4 g, 0.0057 mol) was added with stirring at ambient temperature. After about 3 hours the mixture was acidified with acetic acid and diluted with dichloromethane. The resulting solution was washed well with water and concentrated by evaporation under reduced pressure. The residue was mixed with hexane and the solids present were collected by filtration, washed with ether and with dichloromethane and dried to obtain 0.30 g (38 percent of theory) of the title compound as a white powder melting at 254°-255° C.

Elemental Analysis C₁₃ H₁₀ F₂ N₄ O₃ S Calc.: %C, 45.9; %H, 2.96; %N, 16.5; %S, 9.42 Found: %C, 45.9; %H, 2.55; %N, 16.4; %S, 9.34

39. Preparation of 8-Amino-2-benzylthio-5,7-dibromo[1,2,4]triazolo[1,5-a]pyridine

8-Amino-2-benzylthio[1,2,4]triazolo[1,5-a]pyridine (14.0 g, 0.055 mol) was dissolved in dichloromethane and N-bromosuccinimide (9.7 g., 0.055 mol) was added with stirring at ambient temperature. After 1 hour, another 6.0 g of N-bromosuccinimide was added. The mixture was allowed to stair overnight and was then washed well with dilute aqueous sodium bisulfite solution and with water and concentrated by evaporation under reduced pressure. The residue was chromatographed on silica gel eluting with 30 percent ethyl acetate in hexane to obtain 10.0 g (44 percent of theory) of the title compound as a dark gray powder melting at 116°-118° C.

40. Preparation of 2-Benzylthio-7-bromo-5-methoxy[1,2,4]triazolo[1,5-a]pyridine

2-Benzylthio-5,7-dibromo[1,2,4]triazolo[1,5-a]pyridine (11.6 g, 0.029 mol) and 25 percent sodium methoxide in methanol (13.0 mL, 3.1 g, 0.057 mol) were combined with 300 mL of acetonitrile and the mixture was heated to reflux with stirring for an hour. An additional 26 mL of 25 percent sodium methoxide in methanol was then added. After a 15-min reaction period, the mixture was acidified with acetic acid and the volatiles were removed by evaporation under reduced pressure. The residue was chromatographed on silica gel eluting with 20 percent ethyl acetate in hexane to obtain 4.97 g (49 percent of theory) of the title compound as a tan powder melting at 80°-82° C.

Elemental Analysis C₁₄ H₁₂ BrN₃ OS Calc.: 8C, 48.0; 8H, 3.45; 8N, 12.0; 85, 9.16 Found: 8C, 48.2; %H, 3.42; 8N, 11.9; 85, 9.24

41. Preparation of 3-Amino-2-fluoro-4-methylpyridine

To a solution of 10.1 g (65 mmol) of 2-fluoro-4-methyl-3-nitropyridine in 200 mL of ethyl acetate was added 25 g (0.40 mol) of acetic acid and 0.8 g of 5 percent palladium on carbon catalyst. This mixture was shaken under 50 psig (pounds per square inch gauge, 2400 kiloPascals) pressure of hydrogen for 18 hours, was filtered, and was concentrated by evaporation under reduced pressure to obtain an oil. This oil was partitioned between dilute aqueous sodium bicarbonate and ether. The organic phase was separated, dried over magnesium sulfate, and filtered. The filtrate was concentrated by evaporation under reduced pressure and the residue was purified by column chromatography to obtain 7.2 g (88 percent of theory) of the title compound as a colorless solid melting at 63°-64° C.

Elemental Analysis C₆ H₇ FN₂ Calc.: %C, 57.1; %H, 5.59; %N, 22.2 Found: %C, 57.2; %H, 5.73; %N, 22.1

¹ H NMR CDCl₃ : 7.4 (d, 1H, J=5.0); 6.8 (d, 1H, J=5.0); 3.7 (br, 2H); 2.1 (s, 3H); ¹³ C NMR CDCl₃ : 152.6 (d, J=229); 134.1 (d, J=8.6); 133.8 (d, J=14.5); 128.1 (d, J=27.1); 123.3, 16.4 (d, J=4.1).

3-Amino-2-fluoro-5-methylpyridine was prepared analogously from 2-fluoro-5-methyl-3-nitropyridine. This compound was obtained in 89 percent yield as white solid melting at 27°-28.5° C.

Elemental Analysis C₆ H₇ FN₂ Calc.: %C, 57.1; %H, 5.59; %N, 22.2 Found: %C, 56.9; %H, 5.65; %N, 22.6

¹ H NMR CDCl₃ : 7.2 (d, 1H); 6.8 (d, 1H); 3.7 (br, 2H); 2.1 (s, 3H); ¹³ C NMR CDCl₃ : 151.8 (d, J=229); 134.5 d, J=12.6); 132.2 (d, J=3.9); 129.9 (d, J=28.7); 125.8 (d, J=5.3), 17.8.

42. Preparation of 3-Amino-2-chloro-4-methoxypyridine

To a solution of 6.4 g (51mmol) of 3-amino-4-methoxypyridine in 30 mL of 37 percent aqueous hydrochloric acid was slowly added 7.8 g of 30 percent aqueous hydrogen peroxide at room temperature with stirring. After 30 min this solution was slowly poured into 300 mL of saturated aqueous sodium bicarbonate and the resulting mixture was extracted with ether (3×200mL). The ethereal extracts were combined, dried over magnesium sulfate, and filtered. The filtrate was concentrated by evaporation under reduced pressure to obtain a light brown solid. This solid was purified by column chromatography eluting with 17:83 acetone:hexane to obtain 6.54 g (81 percent of theory) of the title compound as colorless needles melting at 86°-87° C.

Elemental Analysis C₆ H₇ ClN₂ O Calc.: %C, 45.4; %H, 4.45; %N, 17.7 Found: %C, 45.4; %H, 4.65; %N, 17.8

¹ H NMR CDCl₃ : 7.7 (d, 1H, J=5.4), 6.6 (d, 1H, J=5.4), 4.0 (br, 2H), 3.8 (s, 3H); ¹³ C NMR CDCl₃ : 153.3, 138.5, 135.6, 129.9, 105.2, 55.9.

3-Amino-2-chloro-4-ethoxypyridine was prepared from 3-amino-4-ethoxypyridine in an analogous procedure and was obtained as a white solids melting at 72°-73° C.

Elemental Analysis C₇ H₉ ClN₂ O Calc.: %C, 48.7; %H, 5.26; %N, 16.2 Found: %C, 48.9; %H, 4.98; %N, 16.5

¹ H NMR CDCl₃ : 7.7 (d, 1H, J=5.4), 6.6 (d, 1H, J=5.4), 4.1 (q, 2H, J=7.0), 4.0 (br, 2H), 1.5 (t, 3H, J=7.0).

3-Amino-2-chloro-4-propoxypyridine was prepared from 3-amino-4-propoxypyridine in an analogous procedure and was obtained as a white solid melting at 46°-47° C.

Elemental Analysis C₈ H₁₁ ClN₂ O Calc.: %C, 51.5; %H, 5.94; %N, 15.0 Found: %C, 51.8; %H, 5.97; %N, 15.2

¹ H NMR CDCl₃ : 7.7 (d, 1H, J=5.4), 6.6 (d, 1H, J=5.4), 4.1 (br, 2H), 4.0 (t, 2H, J=6.5), 1.84 (m, 2H), 1.0 (t, 3H, J=7.4).

3-Amino-2-chloro-4-(1-methylethoxy)pyridine was prepared from 3-amino-4-(1-methylethoxy)pyridine in an analogous procedure and was obtained as an amber oil.

Elemental Analysis C₈ H₁₁ ClN₂ O Calc.: %C, 51.5; %H, 5.94; %N, 15.0 Found: %C, 51.1; %H, 5.87; %N, 15.4

¹ H NMR CDCl₃ : 7.7 (d, 1H, J=5.5 ), 6.6 (d, 1H, J=5.4 ), 4.6 (m, 1H, J=6.0), 4.0 (br, 2H), 1.34 (d, 6H, J=6.0).

43. Preparation of 3-Amino-2-ethylthio-4-methylpyridine

2-Ethylthio-4-methyl-3-nitropyridine (10.0 g, 50.4 mmol) was added slowly with stirring to a solution of 57 g (0.25 mole) of stannous chloride in 250 mL of concentrated aqueous hydrochloric acid. An exothermic reaction took place. The solution was held at 70° C. for 30 min, cooled, and then poured slowly into saturated aqueous sodium bicarbonate solution. The resulting mixture was extracted with ether and the extract was dried over magnesium sulfate, filtered, and concentrated by evaporation under reduced pressure to obtain 5.8 g (68 percent of theory) of a light yellow oil that solidified upon standing. This solid was recrystallized from hexane to obtain 3.2 g of the title compound as a white solid melting at 37°-38° C.

Elemental Analysis C₈ H₁₂ N₂ S Calc.: %C, 57.1; %H, 7.19; %N, 16.7; %S, 19.1 Found: %C, 57.3; %H, 6.88; %N, 16.8; %S, 19.0

¹ H NMR CDCl₃ : 7.8 (d, 1H, J=4.8), 6.7 (d, 1H, J=4.8), 3.8 (br, 2H), 3.2 (g, 2H, J=7.4), 2.1 (s, 3H), 1.3 (t, 3H, J=7.4); ¹³ C NMR CDCl₃ : 142.2, 139.5, 139.3, 128.9, 122.4, 25.4, 17.0, 15.0.

44. Preparation of Methyl 3-Amino-2-chloroisonicotinate

A mixture of 18 g (118 mmol) of methyl 3-aminoisonicotinate and 12 g (60 mmol) of 1,3-dichloro-5,5-dimethylhydantoin in 1500 mL of tetrachloroethylene was warmed slowly to 80° C. with stirring and held there for 3 hours. The solution was then cooled, filtered, washed with dilute aqueous sodium bicarbonate, dried over magnesium sulfate, filtered, and concentrated by evaporation under reduced pressure to obtain a dark oil. This oil was purified by careful column chromatography to obtain 6.7 g (30 percent of theory) of the title compound as a colorless solid melting at 91°-92° C.

Elemental Analysis C₇ H₇ ClN₂ O₂ Calc.: %C, 45.1; %H, 3.78; %N, 15.0 Found: %C, 45.2; %H, 3.94; %N, 15.1

¹ H NMR CDCl₃ : 7.7 (d, 1H, J=5.1); 7.6 (d, 1H, J=5.1); 6.2 (br, 2H); 3.9 (s, 3H); ¹³ C NMR CDCl₃ : 166.7, 141.9, 139.0, 134.7, 122.8, 116.5, 52.3.

45. Preparation of 3-Amino-4-ethyl-2-fluoropyridine

Trimethylsilyl chloride (2.2 g, (0.18 mmol) and sodium iodide (2.7 g, 0.18 mmol) were added to a solution of 3.6 g (0.15 mmol) of t-butyl N-(4-ethyl-2-fluoro-3-pyridyl)carbamate in 50 mL of dry acetonitrile with stirring at ambient temperature. After 2 hours the mixture was poured into ether and the resulting solution was washed with dilute aqueous sodium bisulfite, dried over magnesium sulfate, and filtered. The filtrate was concentrated by evaporation under reduced pressure to obtain an oil. This oil was purified by column chromatography to obtain 1.6 g (76 percent of theory) of the title compound as a gold oil.

Elemental Analysis C₇ H₉ FN₂ Calc.: %C, 60.0; %H, 6.47; %N, 20.0 Found: %C, 59.8; %H, 6.66; %N, 20.2

¹ H NMR CDCl₃ : 7.4 (d, 1H, J=5.0); 6.8 (d, 1H, J=5.0); 3.7 (br, 2H); 2.45 (q, 2H, J=7.5); 1.2 (t, 3H, J=7.5).

3-Amino-4-(1-methylethyl)-2-fluoropyridine was prepared in an analogous way from t-butyl N-(4-(1-methylethyl)-2-fluoro-3-pyridyl)carbamate. This compound was obtained in 92 percent yield as a gold oil.

Elemental Analysis C₈ H₁₁ FN₂ Calc.: %C, 62.3; %H, 7.19; %N, 12.3 Found: %C, 62.5; %H, 7.24; %N, 12.6

¹ H NMR CDCl₃ : 7.4 (d, 1H, J=5.2); 6.8 (d, 1H, J=5.1); 3.8 (br, 2H); 2.87 (m, 1H); 1.2 (d, 6H, J=6.8).

46. Preparation of t-Butyl N-(4-Ethyl-2-fluoro-3-pyridyl)carbamate

A solution of lithium diisopropylamine (LDA) was prepared from 19.3 mL (137 mmol) of diisopropylamine and 55 mL (137 mmol) of 2.5M n-butyllithium in hexane in 250 mL of dry tetrahydrofuran at -20° C. A solution of 14.4 g (62.5 mmol) of t-butyl N-(4-methyl-2-fluoro-3-pyridyl)carbamate in 80 mL of dry tetrahydrofuran was added dropwise with stirring at a rate slow enough to maintain the temperature below -60° C. After a 30-min reaction period, 27 g (190 mmol) of methyl iodide was added and the solution was allowed to warm to -10° C. The resulting mixture was diluted with 100 mL of aqueous ammonium chloride and 200 mL of ether and the phases were separated. The aqueous phase was washed with ether (3×100 mL). The organic phase and washes were combined, dried over magnesium sulfate, and filtered. The filtrate was concentrated by evaporation under reduced pressure to obtain a gold oil. This oil was purified by column chromatography to obtain 11.4 g (76 percent of theory) of the title compound as a white solid melting at 84°-86° C.

¹ H NMR CDCl₃ : 7.7 (d, 1H, J=5.08); 6.8 (d, 1H, J=5.08); 6.1 (br, 1H); 2.45 (q, 2H, J=7.6); 1.2 (s, 9H); 1.0 (t, 3H, J=7.6).

t-Butyl N-(4-(1-methylethyl)-2-fluoro-3-pyridyl)carbamate was prepared analogously from t-butyl N-(4-ethyl-2-fluoro-3-pyridyl)carbamate. This compound was obtained in 69 percent yield as a colorless solid melting at 60°-62° C.

Elemental Analysis C₁₃ H₁₉ FN₂ O₂ Calc.: %C, 61.4; %H, 7.53; %N, 11.0 Found: %C, 61.6; %H, 7.78; %N, 11.3

¹ H NMR CDCl₃ : 7.9 (d, 1H, J=5.4); 7.0 (d, 1H, J=5.4); 6.0 (br, 1H); 3.2 (m, 1H); 1.4 (s, 9H); 1.2 d, 6H, J=5.2).

47. Preparation of 3-Amino-2,4,5-trichloropyridine

Thirty percent aqueous hydrogen peroxide (3.0 g, 26 mmol) was added dropwise with stirring at 15° C. to a solution of 8.0 g (49 mmol) of 3-amino-4,5-dichloropyridine in 450 mL of 37 percent aqueous hydrochloric acid. After 30 min another 2.6 g (23 mmol) of 30 percent aqueous hydrogen peroxide was added and the solution was allowed to slowly warm to room temperature. The resulting mixture was diluted with water, neutralized with sodium carbonate, and extracted with ether. The ethereal extract was dried over magnesium sulfate and filtered. The filtrate was concentrated by evaporation under reduced pressure to obtain a viscous oil. This oil was partially purified by chromatography to obtain 2.5 g (26 percent of theory) of the title compound, a white solid melting at 88°-90° C., and 5.3 g of a mixture of the title compound and 3-amino-2,4,5,6-tetrachloropyridine.

Elemental Analysis C₅ H₃ Cl₃ N₂ Calc.: %C, 30.4; %H, 1.53; %N, 14.2 Found: %C, 30.5; %H, 1.47; %N, 14.1

¹ H NMR CDCl₃ : 7.7 (s, 1H); 4.6 (br, 2H).

48. Preparation of 3-Amino-4-fluoro-2-methoxypyridine

A solution 5.0 g (26.2 mmol) of p-toluenesulfonic acid monohydrate in 150 mL of toluene was refluxed to azeotropically remove the water and was then allowed to cool. A 5.0 g (20.6 mmol) amount of t-butyl N-(4-fluoro-2-methoxy-3-pyridyl)carbamate was added and the solution was heated to reflux with stirring for 5 min. The mixture was cooled and the liquid was removed by decantation. The solid residue was partitioned between ether and saturated aqueous sodium carbonate and the organic phase was recovered, dried over magnesium sulfate, filtered, and concentrated by evaporation. The residue was purified by flash chromatography to obtain 2.7 g (91 percent of theory) of the title compound as a near-clear oil.

Elemental Analysis C₆ H₇ FN₂ O Calc.: %C, 50.7; %H, 4.96; %N, 19.7 Found: %C, 50.9; %H, 5.26; %N, 19.1

¹ H NMR (CDCl₃): 7.5 (dd, 1H, j=5.7, 7.8); 6.6 (dd, 1H, J=5.7, 9.4); 3.9 (s, 3H); 3.7 (br, 2H).

49. Preparation of t-Butyl N-(4-Fluoro-2-methoxy-3-pyridinyl)carbamate

To a solution of 8 g (35.7 mmol) of t-butyl N-(2-methoxy-3-pyridyl)carbamate in 200 mL of dry tetrahydrofuran was added with stirring at -60° C., 46.2 mL (78.5 mmol) of 1.7M t-butyl lithium in pentane. The resulting solution was allowed to warm slowly with stirring to -20° C. over a 20 to 30 min period. It was then cooled to about -60° C. and 12.2 g (38.7 mmol) of N-fluorodibenzenesulfonimide was added with stirring all at once. The mixture was allowed to warm to -20° C. and was poured into 500 mL of ether. The resulting ethereal solution was washed with a mixture of 2.5 g (41.7 mmol) of acetic acid and 150 mL of water. The aqueous phase was extracted with 200 mL of ether. The ethereal extracts were combined, dried over magnesium sulfate, filtered, and concentrated by evaporation. The residue was purified by flash chromatography to obtain 6.7 g (77 percent of theory) of the title compound as a colorless solid melting at 75°-77° C.

Elemental Analysis C₁₁ H₁₅ FN₂ O₃ Calc.: %C, 54.5; %H, 6.24; %N, 11.6 Found: %C, 54.2; %H, 6.39; %N, 11.4

¹ H NMR (CDCl₃): 7.88 (dd, 1H, j=5.8, 7.6); 6.68 (dd, 1H, j=5.8, 8.9); 5.9 (br, 1H); 3.9 (s, 3H); 1.45 (s, 9H).

50. Preparation of Methyl 3-Amino-2-ethoxyisonicotinate

A solution 7.5 g (39.4 mmol) of p-toluenesulfonic acid monohydrate in 150 mL of toluene was refluxed to azeotropically remove the water. The mixture was allowed to cool and then 11.0 g (37.1 mmol) of t-butyl N-(4-carboxymethyl-2-ethoxy-3-pyridyl)carbamate was added with stirring and the solution was heated to 95° C. for 15 min. The resulting mixture was cooled and the liquid was removed by decantation. The solid residue was partitioned between ether and saturated aqueous sodium carbonate. The organic phase was recovered, dried over magnesium sulfate, filtered, and concentrated by evaporation. The residue was purified by column chromatography to obtain 6.4 g (88 percent of theory) of the title compound as a light yellow solid melting at 59°-60.5° C.

Elemental Analysis C₉ H₁₂ N₂ O₃ Calc.: %C, 55.1; %H, 6.16; %N, 14.3 Found: %C, 54.6; %H, 6.00; %N, 14.5

¹ H NMR (CDCl₃): 7.3 (d, 1H, j=5.6); 7.1 (d, 1H, j=5.6); 5.9 (br, 2H); 4.3 (q, 2H, j=7.1); 3.8 (s, 3H); 1.37 (t, 3H, j=7.1).

Methyl 3-amino-2-methoxyisonicotinate, an amber oil, was prepared analogously.

Elemental Analysis C₈ H₁₀ N₂ O₃ Calc.: %C, 50.0; %H, 4.80; %N, 16.7 Found: %C, 50.2; %H, 5.26; %N, 16.6

¹ H NMR (CDCl₃): 7.3 (d, 1H, j=5.6); 7.1 (d, 1H, j=5.6); 5.9 (br, 2H); 3.96 (s, 3H); 3.8 (s, 3H).

Ethyl 3-amino-2-methoxyisonicotinate, a light yellow oil, was prepared analogously.

Elemental Analysis C₉ H₁₂ N₂ O Calc.: %C, 55.1; %H, 6.16; %N, 14.3 Found: %C, 54.2; %H, 6,56; %N, 14.6

¹ H NMR (CDCl₃): 7.3 (d, 1H, j=5.6); 7.1 (d, 1H, j=5.6); 5.9 (br, 2H); 4.28 (q, 2H, j=7.2); 3.9 (s, 3H); 1.33 (t, 3H, j=7.14).

51. Preparation of t-Butyl N-(4-Carboxymethyl-2-ethoxy-3-pyridinyl)carbamate

To a solution of 12.0 g (50.3 mmol) of t-butyl N-(2-ethoxy-3-pyridinyl)carbamate in 200 mL of dry tetrahydrofuran was added with stirring at -50° C., 66 mL (111 mmol) of 1.7M t-butyl lithium in pentane. The resulting solution was allowed to warm slowly to 0° C. over a 20 to 30 min. period and was then cooled to -60° C. and poured into 500 mL of ether saturated with crushed dry ice (carbon dioxide). The resulting mixture was acidified at room temperature with 3.0 g (50 mmol) of acetic acid and the fine white solid precipitate that formed was collected by filtration and dried under reduced pressure at 50° C. to obtain 17.0 g of a lithium salt containing some tetrahydrofuran. This salt was combined with 30.0 g (211 mmol) of iodomethane in 150 mL of dry dimethyl sulfoxide and the mixture was stirred for 1 hr. It was then poured into 400 mL of water. The aqueous mixture was extracted with 500 then 200 mL of ether. The ether extracts were combined, dried over magnesium sulfate, filtered, and concentrated by evaporation. The residue was purified by column chromatography to obtain 11.5 g (77 percent of theory) of the title compound as a colorless solid melting at 94°-95.5° C.

Elemental Analysis C₁₄ H₂₀ N₂ O₅ Calc.: %C, 56.8; %H, 6.80; %N, 9.45 Found: %C, 56.8; %H, 7.00; %N, 9.63

¹ H NMR (CDCl₃): 7.8 (d, 1H, j=5.3); 7.1 (d, 1H, j=5.3); 6.9 (br, 1H); 4.4 (q, 2H, j=7.0); 3.8 (s, 3H); 1.46 (s, 9H); 1.37 (t, 3H, j=7.0).

t-Butyl N-(4-carboxyethyl-2-methoxy-3-pyridinyl)carbamate, a colorless solid melting at 40°-41° C., was prepared analogously.

Elemental Analysis C₁₄ H₂₀ N₂ O₅ Calc.: %C, 56.8; %H, 6.80; %N, 9.45 Found: %C, 56.6; %H, 6.76;% N, 9.26

¹ H NMR (CDCl₃): 7.9 (d, 1H, j=5.3); 7.1 (d, 1H, j=5.25); 6.9 (br, 1H); 4.27 (q, 2H, j=7.15); 3.96 (s, 3H); 1.45 (s, 9H); 1.33 (t, 3H, j=7.14).

t-Butyl N-(4-Carboxymethyl-2-methoxy-3-pyridinyl)carbamate, a colorless solid melting at 107°-108° C., was obtained analogously.

Elemental Analysis C₁₃ H₁₈ N₂ O₅ Calc.: %C, 55.3; %H, 6.43; %N, 9.92 Found: %C, 55.5; %H, 6.22; %N, 10.1

¹ H NMR (CDCl₃): 7.9 (d, 1H, j=5.3); 7.1 (d, 1H, j=5.4); 6.9 (br, 1H); 3.97 (s, 3H); 1.46 (s, 9H).

52. Preparation of t-Butyl N-(4-Chloro-2-ethoxy-3-pyridinyl)carbamate

To a solution of 15 g (63 mmol) of t-butyl N-(2-ethoxy-3-pyridinyl)carbamate in 175 mL of dry tetrahydrofuran was added with stirring at -60° C., 78 mL (132 mmol) of 1.7M t-butyl lithium in pentane. The resulting solution was allowed to warm to -10° C. over a 30 min. period and was then cooled to -60° C. A A 22.3 g (94 mmol) amount of hexachoroethane was added all at once with stirring and the mixture are allowed to warm to ambient temperature. It was then diluted with 600 mL of ether and the resulting solution was washed with 150 mL of water, dried over magnesium sulfate, filtered, and concentrated by evaporation. The residue was purified by column chromatography to obtain 11.1 g (65 percent of theory) of the title compound as a colorless solid melting at 73°-74° C.

Elemental Analysis C₁₂ H₁₇ ClN₂ O₃ : Calc.: %C, 52.9; %H, 6.28; %N, 10.3 Found: %C, 53.0; %H, 6.30; %N, 10.3

¹ H NMR (CDCl₃): 7.88 (d, 1H, j=5.5); 6.93 (d, 1H, j=5.5); 6.0 (br, 1H); 4.4 (q, 2H, j=7.0); 1.5 (s, 9H); 1.39 (t, 3H, j=7.0.).

53. Preparation of t-Butyl N-(2-Ethoxy-3-pyridinyl)carbamate

To a solution of 38.1 g (0.28 mol) of 3-amino-2-ethoxypyridine in 400 mL of dry dioxane was added with stirring 60 g (0.28 mol) of di-t-butyl dicarbonate and the solution was slowly heated to reflux over a 4 hr period. The resulting solution was cooled below reflux and another 5.0 g (23 mmol) of di-t-butyl dicarbonate was added with stirring the the mixture was reheat at reflux for 1 hr. The volatiles were removed by evaporation under reduced pressure and the residue obtained was purified by column chromatography to obtain 58.3 g (89 percent of theory) of the title compound as a colorless oil.

Elemental Analysis C₁₂ H₁₈ N₂ O₃ Calc.: %C, 60.5; %H, 7.61; %N, 11.8 Found: %C, 59.7; %H, 9.03; %N, 11.9

¹ H NMR (CDCl₃): 8.2 (broad d, 1H, j=7.0); 7.7 (d, 1H, j=5.0); 6.9 (br, 1H); 6.8 (dd, 1H, j=5.0, 5.0), 4.4 (q, 2H, j=7.1); 1.47 (s, 9H); 1.36 (t, 3H, j=7.1).

54. Preparation of 3-Amino-4-ethoxy-2-fluoropyridine

To a solution of 19 g (74 mmol) of t-butyl N-(4-ethoxy-2-fluoro-3-pyridinyl)carbamate and 12.2 g (81.5 mmol) of sodium iodide in 400 mL of dry acetonitrile was added with stirring 8.9 g (81.5 mmol) of trimethylsilyl chloride. The mixture was allowed to react for 4 hr and then a 100 mL solution of aqueous sodium bicarbonate was added with stirring. The resulting mixture was extracted with 1 L of ether and the ether extract was dried over magnesium sulfate, filtered, and concentrated by evaporation. The residue was purified by column chromatography to obtain 6.3 g (55 percent of theory) of the title compound as a colorless solid melting at 76°-77° C.

Elemental Analysis C₇ H₉ FN₂ O Calc.: %C, 53.5; %H, 5.81; %N, 17.9 Found: %C, 54.3; %H, 6.44; %N, 17.7

¹ H NMR (CDCl₃): 7.5 (d, 1H, j=5.74); 6.5 (d, 1H, j=5.64); 4.1 (q, 2H, j=7.0); 3.6 (br, 2H); 1.4 (t, 3H, j=6.9).

3-Amino-2-fluoro-4-methoxypyridine, a colorless solid melting at 48°-50° C., was prepared analogously.

Elemental Analysis C₆ H₇ FN₂ O Calc.: %C, 50.7; %H, 4.96; %N, 19.7 Found: %C, 50.9; %H, 5.13; %N, 19.9

¹ H NMR (CDCl₃): 7.5 (d, 1H, j=5.57); 6.63 (d, 1H, j=5.47); 3.8 (s, 3H); 3.7 (br, 2H).

3-Amino-2-fluoro-4-propoxypyridine, a colorless oil, was prepared analogously.

Elemental Analysis C₈ H₁₁ FN₂ O Calc.: %C, 55.5; %H, 6.51; %N, 16.5 Found: %C, 56.7; %H, 6.66; %N, 16.2

¹ H NMR (CDCl₃): 7.4 (d, 1H, j=5.61); 6.5 (d, 1H, j=5.71); 4.5 (t, 2H, j=6.5); 3.7 (br, 2H); 1.8 (m, 2H, j=7.3); 1.0 (t, 3H, j=7.4).

3-Amino-2-fluoro-4-(1-methylethoxy)pyridine, a gold oil, was prepared analogously.

Elemental Analysis C₈ H₁₁ FN₂ O Calc.: %C, 55.5; %H, 6.51; %N, 16.5 Found: %C, 56.9; %H, 6.69; %N, 16.4

¹ H NMR (CDCl₃): 7.5 (d, 1H, j=5.57); 6.6 (d, 1H, j=5.71); 4.5 (m, 1H, j=6.0); 3.6 (br, 2H); 6.6 (d, 6H, j=6.1).

55. Preparation of t-Butyl N-(4-ethoxy-2-fluoro-3-pyridinyl)carbamate

To a solution of 18.5 g (13 1 mmol) of 4-ethoxy-2-fluoropyridine in 300 mL of dry tetrahydrofuran at -78° C. was added slowly, with stirring and cooling to maintain the temperature below -65° C., 58 mL of 2.5M butyl lithium in hexane. The mixture was allowed to react for 1 hr and then the resulting slurry was poured into 1300 mL of ether containing excess powdered dry ice (carbon dioxide). The fine white precipitate that formed was collected by filtration and dried under reduced pressure for 90 min. The hygroscopic solid obtained was taken into 700 mL of t-butanol and 68 g (0.24 mol) of diphenyl phosphoryl azide was added with stirring. This mixture was slowly warmed to reflux for 2 hr during which time there was a vigorous evolution of nitrogen. The resulting slurry was filtered and the filtrate was diluted with 800 mL of dichloromethane. The organic phase was separated, washed with water (2×100 mL), and concentrated by evaporation to obtain a semi-solid residue. This was dissolved in fresh dichloromethane and the solution was dried over magnesium sulfate, filtered, and concentrated by evaporation. The residue was purified by column chromatography to obtain 19.5 g (63 percent of theory) of the title compound as a colorless solid melting at 130°-131° C.

Elemental Analysis C₁₂ H₁₇ FN₂ O₃ Calc.: %C, 56.2; %H, 6.69; %N, 10.9 Found: %C, 56.1; %H, 6.99; %N, 11.3

¹ H NMR (CDCl₃): 7.85 (d, 1H, j=5.7); 6.6 (d, 1H, j=5.7); 6.0 (br, 1H); 4.1 (q, 2H, j=7.0); 1.4 (t, 3H, j=6.9); 1.35 (t, 3H, j=7.0).

t-Butyl N-(2-fluoro-4-(1-methylethoxy)-3-pyridinyl)carbamate, a colorless solid melting at 80°-81.5° C., was obtained analogously.

Elemental Analysis C₁₃ H₁₉ FN₂ O₃ Calc.: %C, 57.8; %H, 7.09; %N, 10.4 Found: %C, 57.9; %H, 6.94; %N, 10.7

¹ H NMR (CDCl₃): 7.9 d, 1H, j=5.9); 6.7 (d, 1H, j=5.96); 6.0 (br, 1H); 4.6 (m, 1H, j=6.1); 1.45 (s, 9H); 1.35 (d, 6H, j=6.1).

t-Butyl N-(2-fluoro-4-propoxy-3-pyridinyl)carbamate, a colorless solid melting at 84°-86° C., was obtained analogously.

Elemental Analysis C₁₃ H₁₉ FN₂ O₃ Calc.: %C, 57.8; %H, 7.09; %N, 10.4 Found: %C, 57.8; %H, 7.37; %N, 10.5

¹ H NMR (CDCl₃): 7.9 (d, 1H, j=5.8); 6.7 (d, 1H, j=5.8); 5.8 (br, 1H); 4.0 (t, 2H, j=6.5); 1.83 (m, 2H, j=7.36); 1.46 (s, 9H); 1.0 (t, 3H, j=7.5).

56. Preparation of 4-Ethoxy-2-fluoropyridine

To a solution of 60.5 g (0.31 mol) of 3,5-dichloro-4-ethoxy-2-fluoropyridine and 32.2 g (0.32 mol) of sodium acetate in 400 mL of ethanol in a L stirred steel Parr bomb was added 3 g of 5 percent palladium on carbon catalyst. The reactor was charged with 500 pounds per square inch gauge (3550 kiloPascals) of hydrogen and heated with stirring to 100° C. for 4 hr. The mixture was cooled, filtered, and concentrated by evaporation. The residue was dissolved in ether and the resulting solution was dried over magnesium sulfate, filtered, and concentrated by evaporation. The residue was purified by bulb to bulb distillation (60°-80° C. at 0.5 mm Hg (67 Pascals ) to obtain 18.5 g (42 percent of theory ) of the title compound as a colorless oil which solidified upon standing and melted at 35 °-36° C.

Elemental Analysis C₇ H₈ NO Calc.: %C, 59.6; %H, 5.71; %N, 9.92 Found: %C, 59.2; %H, 5.97; %N, 9.95

¹ H NMR (CDCl₃): 7.9 (d, 1H, j=5.8); 6.6 (m, 1H); 6.3 (d, 1H, j=2.2); 4.0 (q, 2H, j=7.0); 1.4 (t, 3H, j=7.0).

2-Fluoro-4-methoxypyridine, a colorless oil boiling at 119°-122° C. at 30 mm Hg (4.0 kiloPascals), was prepared analogously.

Elemental Analysis C₆ H₆ FNO Calc.: %C, 59.6; %H, 5.71; %N, 9.92 Found: %C, 59.2; %H, 5.97; %N, 9.95

¹ H NMR (CDCl₃): 8.0 (d, 1H, j=5.9); 6.7 (m, 1H); 6.4 (d, 1H, j=2.1); 3.9 (s, 3H).

2-Fluoro-4-(1-methylethoxy)pyridine, a colorless oil, was obtained analogously.

Elemental Analysis C₈ H₁₀ FNO Calc.: %C, 61.9; %H, 6.50; %N, 9.03 Found: %C, 61.5; %H, 6.59; %N, 9.32

¹ H NMR (CDCl₃): 8.0 (d, 1H, j=5.9); 6.6 (dd, 1H, j=4.5, 1.4); 6.33 (d, 1H, j=2.0); 4.0 (t, 2H, j=6.6); 1.8 (m, 2H, j=7.3); 1.0 (t, 3H, j=7.3).

2-Fluoro-4-propoxypyridine, a colorless oil, was obtained analogously.

Elemental Analysis C₈ H₁₀ FNO Calc.: %C, 61.9; %H, 6.50; %N, 9.03 Found: %C, 61.0; %H, 7.50; %N, 9.09

¹ H NMR (CDCl₃): 8.0 (d, 1H, j=5.9); 6.6 (m, 1H); 6.3 (d, 1H, j=2.2); 4.57 (m, 1H, j=6.1); 1.3 (d, 6H, j=6.1).

57. Preparation of 5-Dichloro-4-ethoxy-2-fluoropyridine

To a solution of 70.2 g (0.38 mol) of 3,5-dichloro-2,4-difluoropyridine in 600 mL of ethanol was slowly added with stirring a solution of sodium ethoxide in ethanol prepared from 16 g (0.40 mol) of sodium hydride (60 percent in mineral oil, hexane washed) in 200 mL of ethanol. The mixture was allowed to stir overnight and the brown solution obtained was filtered through powdered cellulose and concentrated by evaporation under reduced pressure. The residue was partitioned between 500 mL of ether and 400 mL of water. The organic phase was recovered, dried over magnesium sulfate, filtered, and concentrated by evaporation. The residue was distilled to obtain 62 g (84 percent of theory) of the title compound as a colorless oil having a boiling point of 175°-180° C. at 0.4 mm Hg (53 Pascals).

Elemental Analysis C₇ H₆ Cl₂ FN Calc.: %C, 43.3; %H, 3.12; %N, 7.22 Found: %C, 40.0; %H, 2.92; %N, 6.66

¹ H NMR (CDCl₃): 8.04 (s, 1H); 4.3 q, 2H, j=7.0); 1.48 (t, 3H, j=7.1).

3,5-Dichloro-2-fluoro-4-methoxypyridine, a colorless oil, was obtained analogously.

¹ H NMR (CDCl₃): 8.1 (s, 1H); 4.88 (m, 1H, j=6.1); 1.4 (d, 6H, j=6.1).

3,5-Dichloro-2-fluoro-4-(1-methylethoxy)pyridine, a colorless oil, was obtained analogously.

¹ H NMR (CDCl₃): 8.0 (s, 1H); 4.88 (m, 1H, j=6.1); 1.4 (d, 6H, j=6.1).

3,5-Dichloro-2-fluoro-4-propoxypyridine, a colorless oil, was obtained analogously.

¹ H NMR (CDCl₃): 8.1 (s, 1H); 4.2 (t, 2H, j=6.7); 1.86 (m, 2H, j=7.1); 1.1 (t, 3H, j=7.3).

58. Preparation of 3-Amino-4-fluoro-1-methylindazole

Methylhydrazine (4.96 g, 108mmol was added to a solution of 15.0 g (108 mmol) of 2,6-difluorobenzonitrile in 150 mL of ethanol and the mixture was heated to reflux with stirring for 72 hours. The volatiles were then removed by evaporation under reduced pressure and the residue was dissolved in dichloromethane. The resulting solution was washed with water, dried over magnesium sulfate, and evaporated to dryness under reduced pressure to obtain the title compound as a white solid. This was recrystallized from ethanol to obtain 10.1 g (57 percent of theory) of the title compound as white crystals melting at 125°-127° C.

Elemental Analysis C₈ H₈ FN₃ Calc.: %C, 58.2; %H, 4.88; %N, 25.4 Found: %C, 58.7; %H, 4.76; %N, 25.9

¹ H NMR CDCl₃ : 7.19 (m, 1H), 7.11 (d, 1H, J=8.4), 6.59 (d of d, 1H, J=8.4, 3.3), 5.26 (brs, 2H), 3.72 (s, 3H); ¹³ C NMR CDCl₃ : 157.35, 154.88, 146.20, 146.18, 143.85, 143.76, 127.62, 127.55, 105.31, 105.27, 103.44, 103.24, 101.96, 101.78, 34.74.

59. Preparation of 3-Amino-1-methyl-4-(trifluoromethylthio)pyrazole

Trifluoromethanesulfenyl chloride (11.6 g, 85.0 mmol) was added to a solution of 3-amino-1-methylpyrazole (8.0 g, 82.4 mmol) in 150 mL of dichloromethane with stirring at a rate such that the temperature did not rise above 5° C. When the addition was complete the mixture was allowed to warm to ambient temperature and stir for 18 hours and was then purged with nitrogen gas for 1 hour to remove any unreacted trifluoromethanesulfenyl chloride. The solid that formed during the reaction was collected by filtration and the filtrate was concentrated by evaporation under reduced pressure to obtain additional solids. The combined solids were dissolved in water and the solution was basified with 1N aqueous sodium hydroxide. The resulting mixture was extracted with dichloromethane (2×100 mL) and the extracts were combined, dried over magnesium sulfate, and filtered. The filtrate was concentrated by evaporation under reduced pressure to obtain a solid residue that appeared to be a mixture of two compounds. This solid was recrystalized from methylcyclohexane to obtain 16.2 g (40 percent of theory) of the title compound as a yellow solid melting at 138°-140° C. The impurity was identified as 1-methyl-3-((trifluoromethanesulfenyl)amino)-4-(trifluoromethythio)pyrazole.

Elemental Analysis C₅ H₆ F₃ N₃ S Calc.: %C, 30.5; %H, 3.07; %N, 21.3; %S, 16.3 Found: %C, 30.5; %H, 2.87; %N, 21.1; %S, 16.5

¹ H (CDCl₃): 7.31 (s, 1H), 4.00 (brs, 2H), 3.68 (s, 3H); ¹³ C (CDCl₃): 157.47, 137.04, 133.61, 130.52, 127.44, 124.35, 84.23, 38.97.

60. Preparation of Methyl 6-Chloro-3-methoxypicolinate and Methyl 3-Chloro-6-methoxypicolinate

Sodium methoxide in methanol (100 mL of 25 percent, 22.8 g, 0.42 mol) was added to a solution of methyl 3,6-dichloropicolinate (44.0 g, 0.21 mol) in acetonitrile (400 mL) and the resulting solution was stirred at room temperature for 3.5 hours. The reaction mixture was acidified with acetic acid and the solvent was removed by evaporation. The residue obtained was mixed with dichloromethane and washed sequentially with water, dilute aqueous sodium hydroxide, and dilute aqueous hydrochloric acid. The organic solvent was removed by evaporation and the residue obtained was purified by column chromatography on silica gel, eluting with 20 percent ethyl acetate in hexane until the methyl 3-chloro-6-methoxypicolinate desorbed and then with 25 percent ethyl acetate in hexane until the methyl 6-chloro-3-methoxypicolinate desorbed. Methyl 3-chloro-6-methoxypicolinate (23.4 g) was recovered as a white powder melting at 38°-39° C. and the methyl 6-chloro-3-methoxypicolinate (8.5 g) was recovered as a white powder melting at 81°-82° C.

61. Preparation of 6-Chloro-3-methoxypicolinamide.

Methyl 6-chloro-3-methoxypicolinate (8.0 g, 40 mmol) was added to a mixture of dichloromethane (50 mL) and concentrated ammonium hydroxide (100 mL) at room temperature and the combination was allowed to stir. overnight. The resulting mixture was filtered and the organic and aqueous layers were separated. The organic layer was concentrated by evaporation and the solid residue obtained was washed with water and a little ether and then dried to obtain 6.7 g of the title compound as a white powder melting at 223°-224° C.

62. Preparation of 2-Amino-6-chloro-3-methoxypyridine.

Sodium hydroxide (6.1 g, 196 mmol) was dissolved in water (75 mL) and cooled in an ice bath. Chlorine (3.8 g, 53 mmol) was added slowly with stirring keeping the temperature below 5° C. 6-Chloro-3-methoxypicolinamide (6.1 g, 33 mmol) was added to this solution and the mixture was stirred at 0° C. for 4 hours (until the solids had dissolved). The reaction mixture was acidified with acetic acid and extracted with dichloromethane. The organic extract was concentrated by evaporation and the residue obtained was diluted with hexane. The resulting slurry was filtered and the solids collected were dried to obtain 4.1 g of the title compound as a tan powder melting at 134°-135° C.

Elemental Analysis for C₆ H₇ ClN₂ O Calc.: %C, 45.4; %H, 4.45; %N, 17.7 Found: %C, 45.2; %H, 4.58; %N, 17.4

63. Preparation of N-(6-Chloro-3-methoxy-2-pyridinyl)-N'-carboethoxythiourea.

Ethoxycarbonyl isothiocyanate (3.7 mL, 4.1 g, 31.5 mmol) was added slowly with stirring to a solution of 2-amino-6-chloro-3-methoxypyridine (5.0 g, 31.5 mmol) in chloroform (40 mL) and the mixture was stirred overnight. The solvent was removed by evaporation and the residue obtained was mixed with hexane. The resulting slurry was filtered and the solids collected were washed with a small amount of ether and dried to obtain 8.3 g of the title compound as a tan powder melting at 184°-185° C. with decomposition.

The following compounds were prepared by analogous procedures from known 2-aminopyridine compounds:

N-2-pyridinyl-N'-carboethoxythiourea (a yellow powder melting at 94°-96° C.).

N-(6-Chloro-2-pyridinyl)-N'-carboethoxythiourea (a pale yellow powder melting at 73°-74° C.).

N-(3-Methoxy-2-pyridinyl)-N'-carboethoxy thiourea (a pale yellow powder melting at 147°-148° C.).

N-(3,6-Dichloro-2-pyridinyl)-N'-carboethoxy thiourea (a yellow powder melting at 159°-161° C.).

Elemental Analysis C₉ H₉ Cl₂ N₃ O₂ S Calc.: %C, 36.8; %H, 3.08; %N, 14.3; %S, 10.9 Found: %C, 36.9; %H, 2.88; %N, 14.4; %S, 10.7

N-(3,5-Dichloro-2-pyridinyl)-N'-carboethoxythiourea (a yellow powder).

Elemental Analysis C₉ H₉ Cl₂ N₃ O₂ S Calc.: %C, 36.8; %H, 3.08; %N, 14.3; %S, 10.9 Found: %C, 36.5; %H, 3.36; %N, 14.4; %S, 11.1

N-(3-Fluoro-5-trifluoromethyl-2-pyridinyl)-N'-carboethoxythiourea. (a white powder melting at 86°-90° C.).

Elemental Analysis C₁₀ H₉ F₄ N₃ O₂ S Calc.: %C, 38.6; %H, 2.91; %N, 13.5; %S, 10.3 Found: %C, 38.5; %H, 2.69; %N, 13.4; %S, 10.2

N-(3-Bromo-5-methyl-2-pyridinyl)-N'-carboethoxythiourea (a yellow powder melting at 148°-150° C.).

Elemental Analysis C₁₀ H₁₂ BrN₃ O₂ S Calc.: %C, 37.8; %H, 3.80; %N, 13.2; %S, 10.1 Found: %C, 37.8; %H, 3.72; %N, 13.1; %S, 10.1

64. Preparation of 3-Amino-5-chloro-8-methoxy[1,2,4]triazolo[1,5-a]pyridine.

Hydroxylamine hydrochloride (9.6 g, 138 mmol) and diisopropylethylamine (14.4 mL, 10.7 g, 83 mmol) were mixed with ethanol (300 mL) for a few minutes and then N-(6-chloro-3-methoxy-2-pyridinyl)-N'-carboethoxythiourea (7.6 g, 27.5 mmol) was added with stirring. The resulting mixture was stirred at room temperature for 20 min and then heated to reflux for 3 hours. The volatile components were removed by evaporation and the residue obtained was mixed with water. The resulting slurry was filtered and the solids collected were washed with ether, a small amount of methanol, and finally hexane and were then dried. The title compound (3.2 g) was obtained as a tan powder melting at 207°-208° C.

Elemental Analysis C₇ H₇ ClN₄ O Calc.: %C, 42.3; %H, 3.55; %N, 28.2 Found: %C, 41.7, %H, 3.91; %N, 27.9

The following compounds were prepared by analogous procedures from the products of Example 63:

2-Amino[1,2,4]triazolo[1,5-a]pyridine (a yellow powder melting at 100°-102° C.).

2-Amino-5-chloro[1,2,4]triazolo[1,5-a]pyridine (an off-white powder melting at 212°-213° C.).

Elemental Analysis C₆ H₅ ClN₄ Calc.: %C, 42.7; %H, 2.99; %N, 33.2 Found: %C, 42.7; %H, 3.01; %N, 33.6

2-Amino-8-methoxy[1,2,4]triazolo[1,5-a]pyridine (a light tan powder melting at 204°-206° C.).

Elemental Analysis C₆ H₈ N₄ O Calc.: %C, 51.2; %H, 4.91; %N, 34.1 Found: %C, 51.3; %H, 6.09; %N, 33.8

2-Amino-5,8-dichloro[1,2,4]triazolo[1,5-a]pyridine (a white powder melting at 236°-238° C.).

Elemental Analysis C₆ H₄ Cl₂ N₄ Calc.: %C, 35.5; %H, 1.99; %N, 27.6 Found: %C, 35.6; %H, 2.12; %N, 27.4

2-Amino-6,8-dichloro[1,2,4]triazolo[1,5-a]pyridine (a white powder melting above 280° C.).

Elemental Analysis C₆ H₄ Cl₂ N₄ Calc.: %C, 35.5; %H, 1.99; %N, 27.6 Found: %C, 35.8; %H, 1.96; %N, 27.3

2-Amino-8-fluoro-6-trifluoromethyl[1,2,4]triazolo[1,5-a]pyridine (an off-white powder melting at -224° C.).

Elemental Analysis C₇ H₄ F₄ N₄ Calc.: %C, 38.2; %H, 1.83; %N, 25.5 Found: %C, 38.1; %H, 2.04; %N, 24.1

2-Amino-8-bromo-6-methyl[1,2,4]triazolo[1,5-a]pyridine (a white powder melting above 280° C.).

Elemental Analysis C₇ H₇ BrN₄ Calc.: %C, 37.0; %H, 3.11; %N, 24.7 Found: %C, 37.0; %H, 3.14; %N, 24.7

65. Preparation of 2-Benzylthio-5-chloro-8-methoxy[1,2,4]triazolo[1,5-a]pyridine.

t-Butyl nitrite (6.7 mL, 5.2 g, 50 mmol) was added all at once to a mixture of 2-amino-5-chloro-8-methoxy[1,2,4]triazolo[1,5-a]pyridine (5.0 g, 25 mmol) and dibenzyl disulfide (18.6g, 75 mmol) in acetonitrile (250 mL) at 35° C. with stirring. The reaction was exothermic, but a mantle was placed under the reaction flask to heat it to reflux rapidly. The evolution of gas began immediately and stopped after about 15 minutes. The volatiles were removed by evaporation and the residue was purified by column chromatography on silica gel eluting with 30 percent ethyl acetate in hexane. The dibenzyl disulfide eluted first followed by the title compound. The solvent was removed by evaporation and the residue was mixed with hexane and filtered. The collected solids were dried to obtain 6.1 g of the title compound as a light tan powder melting at 99°-100° C.

Elemental Analysis C₁₄ H₁₂ ClN₃ OS Calc.: %C, 55.0; %H, 3.96; %N, 13.7; %S, 10.5 Found: %C, 54.9; %H, 4.08; %N, 13.9; %S, 10.5

2-Benzylthio-5-chloro[1,2,4]triazolo[1,5-a]pyridine (a pale yellow powder melting at 65°-66° C.) was prepared by an analogous procedure.

Elemental Analysis C₁₃ H₁₀ ClN₃ S Calc.: %C, 56.6; %H, 3.66; %N, 15,2; %S, 11.6 Found: %C, 56.7; %H, 3.56; %N, 15.4; %S, 11.5

66. Preparation of 2-Chlorosulfonyl-5-chloro-8-methoxy[1,2,4]triazolo[1,5-a]pyridine

Chlorine (6.7 g, 96 mmol) was added slowly with stirring at 3°-7° C. to a mixture of 2-benzylthio-5-chloro-8-methoxy[1,2,4]triazolo[1,5-a]pyridine (6.5 g, 21 mmol) in dichloromethane (75 mL) and water (75 mL) and the reaction mixture was stirred for a 30 min period after the chlorine had been added. The layers were separated and the organic layer was dried over a mixture of magnesium and sodium sulfates and concentrated by evaporation under reduced pressure. The residue obtained was triturated with hexane, filtered, and dried to obtain 5.2 g of the title compound as a light tan powder melting at 149°-151° C.

67. Preparation of N-(2,6-Difluorophenyl)-5-chloro-8-methoxy[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide.

Dimethyl sulfoxide (90 microliters, 94 micrograms, 1.2 mmol) was added with stirring to a solution of 2-chlorosulfonyl-5-chloro-8-methoxy[1,2,4]triazolo[1,5-a]pyridine (1.7 g, 6 mmol), 2,6-difluoroaniline (1.6 g, 12 mmol) and pyridine (0.5 g, 6 mmol) in acetonitrile (20 mL) at ambient temperature. The reaction was complete in about 30 min. Dichloromethane and water were added and the solid that separated was collected by filtration. The organic layer was concentrated by evaporation and the residue obtained was washed with water and combined with the earlier obtained solid. The combined solids were then washed with ether and hexane and dried to obtain 1.4 g of the title compound as an off-white powder melting at 190°-191° C.(d).

Elemental Analysis C₁₃ H₉ ClF₂ N₄ O₃ S Calc.: %C, 41.7; %H, 2.42; %N, 15.0; %S, 8.56 Found: %C, 41.3; %H, 2.37; %N, 15.0; %S, 8.69

The following compounds were prepared by analogous procedures:

N-(2-Chloro-4-methoxy-3-pyridinyl)-5-chloro-8-methoxy[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide (a white powder melting at 253°-254° C.(d)).

Elemental Analysis C₁₃ H₁₁ Cl₂ N₅ O₄ S Calc.: %C, 38.6; %H, 2.74; %N, 17.3; %S, 7.90 Found: %C, 38.8; %H, 2.90; %N, 17.4; %S, 7.47

N-(1-Methyl-4-bromo-3-pyrazoyl)-5-chloro-8-methoxy[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide light tan powder melting at 269°-270° C.(d)).

Elemental Analysis C₁₁ H₁₀ BrClN₆ O₃ S Calc.: %C, 31.3; %H, 2.39; %N, 19.9; %S, 7.60 Found: %C, 31.9; %H, 2.39; %N, 19.6; %S, 7.60

68. Preparation of N-(2,6-Difluorophenyl)-5,8-dimethoxy[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide

N-(2,6-Difluorophenyl)-5-chloro-8-methoxy[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide (1.0 g, 2.7 mmol), sodium methoxide (25 percent in methanol, 2.5 mL, 0.58 g, 11 mmol) and dimethyl sulfoxide (20 mL) were mixed with stirring and slowly heated to 70° C. over a 40-min period. After a short reaction period, the reaction mixture was acidified with acetic acid and diluted With dichloromethane and water. The solid that separated was recovered by filtration. The organic layer was separated, was washed several times with water, and was concentrated by evaporation under reduced pressure. The residue obtained was washed with water and combined with the previously obtained solid. The combined solids were washed with ether and hexane and dried to obtain 0.7 g of the title compound as an off-white powder melting at 319°-320° C.(d).

Elemental Analysis C₁₄ H₁₂ F₂ N₄ O₄ S Calc.: %C, 45.1; %H, 3.27; %N, 15.1; %S, 8.66 Found: %C, 43.4; %H, 3.13; %N, 14.8; %S, 8.23

The following compounds were prepared by analogous procedures from compounds of Example 68:

N-(2-Chloro-4-methoxy-3-pyridinyl)-5,8-dimethoxy[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide (a light tan powder melting at 257°-258° C.(d)).

Elemental Analysis C₁₄ H₁₄ ClN₅ O₅ S Calc.: %C, 42.1; %H, 3.53; %N, 17.7; %S, 8.02 Found: %C, 41.7; %H, 2.85; %N, 17.3; %S, 7.74

N-(1-Methyl-4-bromo-3-pyrazoyl)-5,8-dimethoxy[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide (a tan powder melting at 257°-258° C.(d)).

Elemental Analysis C₁₂ H₁₃ BrN₆ O₄ S Calc.: %C, 34.5; %H, 3.14; %N, 20.1; %S, 7.68 Found: %C, 34.1; %H, 2.98; %N, 19.8; %S, 7.27

69. Evaluation of Postemergence Herbicidal Activity

Seeds of the desired test plant species were planted in Grace-Sierra MetroMix® 306 planting mixture, which typically has a pH of 6.0 to 6.8 and an organic matter content of about 30 percent, in plastic pots with a surface area of 64 square centimeters. When required to ensure good germination and healthy plants, a fungicide treatment and/or other chemical or physical treatment was applied. The plants were grown for 7-21 days in a greenhouse with an approximately 15 hr photoperiod maintained at about 23°-29° C. during the day and 22°-28° C. during the night. Nutrients and water were added on a regular basis and supplemental lighting was provided with overhead metal halide 1000 Watt lamps as necessary. The plants were employed for testing after they reached the first or second true leaf stage.

A weighed amount, determined by the highest rate to be tested, of each test compound was placed in a 20 mL glass vial and was dissolved in 4 mL of a 97:3 (volume/volume) mixture of acetone and dimethyl sulfoxide to obtain concentrated stock solutions. If the test compound did not dissolve readily, the mixture was warmed and/or sonicated. The concentrated stock solutions obtained were diluted with an aqueous mixture containing acetone, water, isopropyl alcohol, dimethyl sulfoxide, Atplus 411F crop oil concentrate, and Triton X-155 surfactant in a 48.5:39:10:1.5:1.0:0.02 v/v ratio to obtain spray solutions of known concentration. The solutions containing the highest concentration to be tested were prepared by diluting 2 mL aliquots of the stock solution with 13 mL of the mixture and lower concentrations were prepared by dilution of appropriate smaller portions of the stock solution. Approximately 1.5 mL aliquots of each solution of known concentration were sprayed evenly onto each of the test plant pots using a DeVilbiss atomizer driven by compressed air pressure of 2 to 4 psi (140 to 280 kiloPascals) to obtain thorough coverage of each plant. Control plants were sprayed in the same manner with the aqueous mixture. In this test an application rate of 1 ppm results in the application of approximately 1 g/Ha.

The treated plants and control plants were placed in a greenhouse as described above and watered by sub-irrigation to prevent wash-off of the test compounds. After 2 weeks the condition of the test plants as compared with that of the untreated plants was determined visually and scored on a scale of 0 to 100 percent where 0 corresponds to no injury and 100 corresponds to complete kill. Some of the compounds tested, application rates employed, plant species tested, and results are given in Tables 2 and 2A.

                                      TABLE 2                                      __________________________________________________________________________     POSTEMERGENCE HERBICIDAL ACTIVITY                                                                                 Wild    Barn-                                                                              Giant                           Cpd.                                                                              Rate,                                                                             Cockle-                                                                             Jimson-                                                                             Lambs                                                                               Morning-                                                                            Velvet-                                                                             Field                                                                              Buck-                                                                              Black-                                                                             yard                                                                               fox-                                                                               Johnson-                    No.                                                                               ppm                                                                               bur  weed quarters                                                                            glory                                                                               leaf Pansy                                                                              wheat                                                                              grass                                                                              grass                                                                              tail                                                                               grass                       __________________________________________________________________________     1  62.5                                                                              20   70   70   95   95   30  90  0   0   0   0                           2  62.5                                                                              95   80   70   95   100  40  90  0   0   0   0                           3  125                                                                               85   70   85   80   95   30  80  20  20  0   20                          4  125                                                                               100  80   20   70   100  75  75  0   0   0   0                           5  62.5                                                                              85   50   90   50   95   85  0   0   0   0   0                           6  125                                                                               0    0    25   50   85   100 0   25  0   0   0                           7  125                                                                               98   70   70   70   80   100 75  70  50  50  70                          8  3.9                                                                               100  50   85   70   65   60  70  100 80  25  93                          9  31.3                                                                              90   95   70   90   98   100 85  85  80  70  75                          10 500                                                                               80   80   20   40   80   100 40  80  70  0   0                           11 125                                                                               80   40   20   80   85   95  50  20  50  35  0                           12 250                                                                               90   90   60   80   95   100 70  80  98  60  80                          13 15.6                                                                              75   70   90   100  98   100 85  80  90  50  90                          14 250                                                                               100  100  60   100  80   100 90  80  98  85  70                          15 1000                                                                              80   30   0    40   65   25  0   60  0   0   0                           16 125                                                                               35   80   90   100  95   100 --  95  --  20  50                          17 31.3                                                                              40   65   65   85   85   100 90  0   35  25  35                          18 62.5                                                                              95   95   90   75   95   95  --  0   --  40  10                          19 15.6                                                                              95   75   80   80   85   80  80  85  90  90  80                          20 3.9                                                                               100  90   80   80   85   85  80  35  80  50  88                          21 7.8                                                                               100  90   90   86   85   75  85  85  88  35  85                          22 83.3                                                                              85   75   50   90   90   50  30  20  35  0   0                           23 15.6                                                                              --   --   75   100  85   85  90  80  85  75  90                          24 15.6                                                                              88   --   75   90   --   90  90  70  89  70  85                          25 31.3                                                                              100  100  70   98   98   100 100 90  85  40  70                          26 31.3                                                                              98   70   40   80   85   100 100 20  30  20  60                          27 31.3                                                                              90   80   50   60   98   80  100 50  40  20  40                          28 1.95                                                                              90   85   60   95   75   98  100 55  70  20  75                          29 31.3                                                                              100  70   80   50   99   100 99  80  80  55  75                          30 15.6                                                                              98   98   30   100  85   90  85  98  80  30  75                          31 3.9                                                                               100  88   40   80   90   100 90  0   25  60  50                          32 7.8                                                                               90   70   78   90   88   100 100 20  80  75  80                          33 31.3                                                                              98   50   80   100  80   100 80  80  75  50  75                          34 31.3                                                                              98   70   80   98   100  100 85  70  98  40  98                          35 31.3                                                                              90   50   70   90   80   100 100 20  40  0   70                          36 31.3                                                                              90   55   80   100  80   98  99  35  70  40  90                          37 3.9                                                                               55   60   20   99   97   100 100 35  0   0   0                           38 7.8                                                                               100  95   15   70   97   100 95  0   0   30  65                          39 15.6                                                                              97   80   60   70   93   99  70  50  35  50  80                          40 31.3                                                                              93   80   35   70   93   100 80  80  70  60  75                          41 15.6                                                                              100  85   0    93   99   90  99  50  30  45  65                          42 15.6                                                                              100  85   100  90   90   100 85  50  75  75  75                          43 62.5                                                                              --   90   90   100  90   90  88  50  65  70  55                          44 7.8                                                                               --   90   90   85   85   85  75  85  85  70  85                          45 15.6                                                                              --   90   90   90   85   75  75  50  65  35  60                          46 250                                                                               80   100  50   80   80   80  40  70  70  50  75                          47 15.6                                                                              70   70   55   90   70   100 0   90  70  70  80                          48 7.8                                                                               100  83   10   100  80   100 80  0   0   20  15                          49 31.3                                                                              100  99   50   80   99   99  75  0   10  45  65                          50 31.3                                                                              85   99   30   70   95   80  65  70  75  50  83                          51 15.6                                                                              90   60   75   98   100  90  85  90  75  30  95                          52 500                                                                               50   80   70   90   88   100 75  20  20  25  60                          53 15.6                                                                              40   97   85   80   85   100 65  70  90  35  95                          54 62.5                                                                              40   95   85   80   100  70  65  90  80  80  93                          55 62.5                                                                              90   85   90   90   70   88  80  88  85  70  85                          56 31.3                                                                              90   85   75   87   90   100 85  90  75  70  70                          57 15.6                                                                              90   70   85   90   88   85  80  75  85  65  88                          58 3.9                                                                               70   60   90   85   85   100 90  80  50  30  60                          59 31.3                                                                              90   85   60   85   85   100 80  80  60  50  85                          60 31.3                                                                              95   85   75   85   85   95  85  90  80  60  90                          61 15.6                                                                              90   --   85   85   85   98  95  85  75  60  80                          62 31.3                                                                              85   --   90   80   85   100 90  75  40  60  50                          63 15.6                                                                              85   --   85   80   90   90  95  90  40  55  80                          64 500                                                                               90   90   50   70   25   60  50  60  30  50  80                          65 500                                                                               75   75   60   30   60   70  60  0   0   10  40                          66 7.8                                                                               90   90   100  75   85   95  98  70  80  95  100                         67 15.6                                                                              88   --   55   85   85   85  88  60  70  70  85                          69 15.6                                                                              90   --   85   90   88   90  88  85  90  80  90                          70 15.6                                                                              90   88   30   88   75   80  100 70  30  30  40                          71 15.6                                                                              90   85   60   90   88   10  90  70  50  35  40                          72 7.8                                                                               90   85   88   90   80   75  85  80  75  60  75                          73 3.9                                                                               50   70   60   87   90   75  80  50  85  40  85                          74 62.5                                                                              100  90   50   80   80   80  60  60  75  50  30                          75 62.5                                                                              100  70   40   75   90   85  40  40  10  20  0                           76 125                                                                               80   80   65   90   80   80  50  50  75  70  70                          77 125                                                                               98   60   40   90   98   80  65  50  50  45  40                          78 31.3                                                                              100  80   40   90   98   100 85  60  60  0   40                          79 62.5                                                                              90   --   70   75   80   100 85  70  70  40  80                          80 0.98                                                                              85   60   20   60   80   75  100 60  60  30  60                             7.8                                                                               100  100  75   90   100  90  98  98  78  40  75                          81 1.95                                                                              95   80   60   98   75   100 95  80  75  40  80                          82 31.3                                                                              100  90   70   98   85   100 100 95  98  80  98                          83 31.3                                                                              100  100  90   90   90   100 100 88  90  85  100                         84 7.8                                                                               100  30   90   90   90   100 85  90  80  50  80                          85 15.6                                                                              80   60   70   80   90   80  50  90  75  50  98                          86 3.9                                                                               90   80   70   55   50   100 80  95  75  75  40                          87 125                                                                               60   50   75   75   85   70  --  75  75  20  70                          88 31.3                                                                              80   80   100  75   85   80  85  80  65  40  90                          89 125                                                                               100  85   50   85   80   95  80  30  60  40  40                          90 15.6                                                                              100  85   75   60   70   --  40  50  40  30  50                          91 3.9                                                                               85   90   40   85   60   60  75  60  80  20  90                          92 125                                                                               100  80   75   85   85   85  90  80  85  50  85                          93 500                                                                               100  75   60   75   60   30  40  40  10  20  0                           94 62.5                                                                              100  85   25   85   50   60  40  70  30  30  60                          95 125                                                                               100  --   70   100  75   97  83  20  5   40  20                          96 0.49                                                                              90   80   10   70   80   80  65  10  0   0   10                          97 62.5                                                                              90   90   80   80   90   95  85  70  88  60  80                          98 1.95                                                                              85   80   60   100  97   80  75  50  60  0   80                          99 125                                                                               90   50   60   40   80   100 60  50  40  20  30                          100                                                                               250                                                                               99   --   30   60   93   10  85  30  70  20  10                          101                                                                               15.6                                                                              100  80   80   98   70   80  75  80  90  75  90                          102                                                                               1000                                                                              80   --   0    0    10   0   0   0   0   0   0                           103                                                                               7.8                                                                               93   --   80   60   80   65  95  70  85  70  90                          104                                                                               31.3                                                                              95   --   97   70   75   80  97  90  80  60  99                          105                                                                               500                                                                               93   --   55   20   70   60  65  45  65  45  35                          106                                                                               3.9                                                                               85   --   35   50   15   90  65  93  75  55  0                           107                                                                               500                                                                               97   --   60   60   80   20  80  10  5   0   0                           108                                                                               1.95                                                                              97   --   70   75   90   80  80  40  50  50  55                          109                                                                               31.3                                                                              98   90   55   90   65   65  75  0   10  0   40                          110                                                                               7.8                                                                               90   65   85   65   70   85  70  15  65  60  65                          111                                                                               62.5                                                                              99   60   97   93   75   97  70  75  70  65  70                          112                                                                               125                                                                               100  95   20   70   100  45  70  0   0   0   0                           113                                                                               62.5                                                                              98   90   0    100  90   20  75  0   0   0   0                           114                                                                               500                                                                               90   75   50   75   90   0   0   0   0   0   0                           115                                                                               1.95                                                                              100  85   70   100  80   65  65  45  0   60  50                          116                                                                               3.9                                                                               97   70   85   97   95   75  --  25  65  0   60                          117                                                                               7.8                                                                               100  70   100  100  90   80  80  83  80  65  65                          118                                                                               62.5                                                                              100  90   60   85   80   60  80  0   75  30  80                          119                                                                               1000                                                                              100  15   0    --   0    70  0   0   35  0   0                           120                                                                               125                                                                               100  60   60   85   75   75  0   40  35  0   0                           121                                                                               62.5                                                                              100  85   40   98   78   80  78  75  70  65  70                          122                                                                               62.5                                                                              90   90   40   80   85   70  80  0   75  70  75                          123                                                                               15.6                                                                              90   90   70   80   75   90  75  60  75  80  55                          124                                                                               1000                                                                              75   80   0    80   30   75  50  0   30  0   0                           125                                                                               500                                                                               85   80   80   75   40   90  30  78  80  40  80                          126                                                                               15.6                                                                              100  85   80   98   80   50  80  0   0   50  0                           127                                                                               62.5                                                                              100  75   80   80   80   70  80  80  75  75  75                          128                                                                               31.3                                                                              85   90   75   75   80   90  80  75  60  60  75                          129                                                                               15.6                                                                              100  90   75   90   70   75  80  75  75  98  90                          130                                                                               31.3                                                                              --   100  60   80   75   85  60  90  80  --  80                          131                                                                               250                                                                               --   98   50   90   90   75  80  50  30  --  75                          132                                                                               3.9                                                                               --   100  30   85   90   80  80  85  55  --  75                          133                                                                               125                                                                               --   98   30   95   90   85  80  90  45  --  75                          134                                                                               15.6                                                                              90   80   95   90   70   85  --  50  70  20  50                          135                                                                               31.3                                                                              90   --   85   90   85   --  85  75  65  75  --                          136                                                                               125                                                                               70   90   80   90   75   80  80  75  75  0   70                          137                                                                               500                                                                               95   --   70   75   70   --  75  80  5   60  --                          138                                                                               31.3                                                                              90   90   90   80   80   70  80  98  85  70  95                          139                                                                               31.3                                                                              90   95   75   85   80   75  75  98  90  75  90                          140                                                                               31.3                                                                              80   90   95   85   75   75  85  75  75  60  75                          141                                                                               1000                                                                              70   80   60   70   40   75  75  20  20  0   40                          142                                                                               500                                                                               85   --   20   100  75   --  70  40  0   55  --                          143                                                                               250                                                                               95   --   0    90   75   --  70  --  0   30  --                          144                                                                               500                                                                               89   --   0    70   20   --  55  --  0   50  --                          145                                                                               7.8                                                                               100  --   89   90   88   --  65  75  65  30  --                          146                                                                               7.8                                                                               85   --   80   100  80   --  80  30  60  40  --                          147                                                                               31.3                                                                              80   --   60   90   80   --  88  80  80  75  --                          148                                                                               31.3                                                                              98   --   90   75   95   --  75  75  80  80  --                          151                                                                               31.3                                                                              98   --   90   80   95   --  80  75  80  70  --                          152                                                                               1000                                                                              98   --   50   85   30   --  75  70  60  60  --                          153                                                                               62.5                                                                              88   --   75   100  85   --  80  65  55  70  --                          154                                                                               15.6                                                                              100  --   80   100  85   --  75  70  80  75  --                          155                                                                               6205                                                                              100  --   90   100  90   --  85  88  85  75  --                          156                                                                               125                                                                               85   --   85   80   70   --  80  85  80  80  --                          157                                                                               15.6                                                                              100  --   60   100  78   --  85  60  80  70  --                          158                                                                               7.8                                                                               100  --   40   86   89   --  75  20  25  30  --                          159                                                                               31.3                                                                              90   --   85   85   88   --  88  80  85  85  --                          160                                                                               62.5                                                                              90   --   85   90   80   --  80  88  80  85  --                          161                                                                               125                                                                               80   --   85   85   80   --  85  80  80  80  --                          162                                                                               31.3                                                                              100  --   80   90   --   --  --  0   30  60  --                          163                                                                               125                                                                               80   --   95   95   --   --  --  50  75  85  --                          164                                                                               125                                                                               90   --   80   100  --   --  --  0   20  50  --                          165                                                                               15.6                                                                              100  --   90   100  --   --  --  75  80  95  --                          166                                                                               1.95                                                                              90   --   85   95   --   --  --  50  85  85  --                          167                                                                               31.3                                                                              90   --   95   100  --   --  --  30  75  90  --                          168                                                                               62.5                                                                              100  --   88   90   80   --  80  85  80  88  --                          169                                                                               15.6                                                                              95   --   90   100  85   --  85  75  85  90  --                          170                                                                               31.3                                                                              90   --   85   85   70   --  85  90  85  80  --                          171                                                                               31.3                                                                              100  --   70   90   90   --  85  90  70  25  --                          172                                                                               125                                                                               90   --   80   90   90   --  85  70  75  60  --                          173                                                                               125                                                                               95   --   30   95   75   --  85  35  30  0   --                          174                                                                               31.3                                                                              100  --   85   90   80   --  80  75  80  60  --                          176                                                                               31.3                                                                              100  --   75   85   88   --  85  70  70  60  --                          177                                                                               125                                                                               100  --   60   85   85   --  85  40  20  50  --                          178                                                                               31.3                                                                              100  --   80   95   90   --  80  70  80  60  --                          179                                                                               62.5                                                                              100  --   60   80   85   --  80  15  20  20  --                          180                                                                               250                                                                               95   --   50   95   75   --  80  30  30  25  --                          181                                                                               125                                                                               85   --   88   88   85   --  78  60  80  70  --                          182                                                                               500                                                                               100  --   72   85   90   --  75  20  0   30  --                          183                                                                               500                                                                               90   --   60   100  90   --  85  20  10  15  --                          186                                                                               250                                                                               100  --   90   85   88   --  80  80  80  85  --                          187                                                                               62.5                                                                              90   --   90   85   90   --  85  85  85  80  --                          188                                                                               31.3                                                                              90   --   60   85   35   --  80  35  75  60  --                          189                                                                               31.3                                                                              90   --   85   85   75   --  85  25  25  40  --                          190                                                                               7.8                                                                               100  --   80   95   85   --  85  40  70  30  --                          191                                                                               3.9                                                                               100  --   70   90   80   --  80  10  50  40  --                          192                                                                               62.5                                                                              75   --   80   80   70   --  80  80  75  60  --                          193                                                                               31.3                                                                              100  --   70   95   55   --  70  50  80  50  --                          194                                                                               15.6                                                                              100  --   70   90   60   --  60  80  80  85  --                          195                                                                               250                                                                               80   --   70   75   50   --  80  70  70  70  --                          198                                                                               31.3                                                                              100  --   98   80   98   --  90  30  50  70  --                          199                                                                               62.5                                                                              98   --   80   100  95   --  90  50  80  75  --                          200                                                                               62.5                                                                              95   --   60   85   70   --  80  85  90  75  --                          201                                                                               31.3                                                                              100  --   85   90   95   --  90  60  85  60  --                          202                                                                               125                                                                               85   --   90   90   85   --  90  80  85  85  --                          203                                                                               125                                                                               50   --   85   85   80   --  80  90  85  95  --                          204                                                                               250                                                                               90   --   85   90   75   --  80  40  75  30  --                          205                                                                               62.5                                                                              90   --   90   90   90   --  85  90  85  80  --                          208                                                                               31.3                                                                              90   --   80   90   70   --  90  40  70  75  --                          212                                                                               15.6                                                                              100  --   40   90   40   --  85  90  65  40  --                          __________________________________________________________________________

                                      TABLE 2A                                     __________________________________________________________________________     POSTEMERGENCE HERBICIDAL ACTIVITY                                                                                Wild    Barn-                                                                              Giant                                                                              Rox                          Cpd.                                                                              Rate,                                                                             Chick-                                                                             Cockle-                                                                             Lambs-                                                                              Morning-                                                                            Velvet-                                                                             Field                                                                              Buck-                                                                              Black-                                                                             yard                                                                               fox-                                                                               Orange                       No.                                                                               ppm                                                                               weed                                                                               bur  quarters                                                                            glory                                                                               leaf Pansy                                                                              wheat                                                                              grass                                                                              grass                                                                              tail                                                                               Sorghum                      __________________________________________________________________________     213                                                                               7.8                                                                               95  98   50   100  85   80  90  40  40  0   95                           214                                                                               7.8                                                                               90  90   60   80   70   70  90  80  65  50  95                           215                                                                               15.6                                                                              70  90   75   85   70   80  90  90  75  10  98                           216                                                                               7.8                                                                               98  90   75   90   70   90  85  90  75  20  95                           217                                                                               125                                                                               75  90   75   90   85   85  75  85  80  78  90                           218                                                                               31.3                                                                              100 70   65   85   85   78  85  35  30  30  55                           219                                                                               31.3                                                                              90  75   75   80   75   80  85  70  40  60  95                           220                                                                               125                                                                               90  80   70   80   85   88  85  75  40  60  60                           221                                                                               62.5                                                                              85  85   70   75   75   85  85  75  75  70  60                           223                                                                               31.3                                                                              90  70   90   90   60   90  60  85  65  65  90                           224                                                                               500                                                                               50  70   100  70   75   90  85  85  35  20  78                           225                                                                               250                                                                               80  85   --   80   60   90  80  85  80  35  70                           226                                                                               7.8                                                                               90  100  98   70   75   80  80  80  78  70  90                           227                                                                               7.8                                                                               90  100  95   70   70   90  80  95  80  78  90                           228                                                                               62.5                                                                              95  100  90   90   85   90  75  90  80  90  95                           229                                                                               62.5                                                                              95  90   90   50   75   75  80  60  75  60  60                           230                                                                               125                                                                               70  --   95   88   90   90  80  88  85  80  85                           231                                                                               125                                                                               78  --   95   85   90   88  85  90  88  30  88                           232                                                                               15.6                                                                              70  --   90   90   88   95  90  80  75  75  90                           233                                                                               31.3                                                                              85  --   90   80   85   0   85  83  85  95  90                           234                                                                               15.6                                                                              85  99   100  80   95   83  95  98  78  85  95                           235                                                                               7.8                                                                               95  98   99   75   75   85  85  85  78  55  78                           236                                                                               15.6                                                                              98  100  100  75   70   83  80  85  80  50  78                           238                                                                               15.6                                                                              90  100  95   80   90   85  80  80  78  55  78                           239                                                                               15.6                                                                              80  70   95   90   70   78  95  98  75  78  78                           240                                                                               7.8                                                                               78  98   98   75   70   75  88  98  78  65  75                           241                                                                               31.3                                                                              80  90   40   75   95   80  80  0   0   0   0                            242                                                                               3.9                                                                               85  100  90   95   95   85  80  60  70  40  99                           243                                                                               3.9                                                                               90  100  100  95   80   80  50  70  75  35  78                           244                                                                               31.3                                                                              98  100  98   98   65   85  75  95  78  98  78                           245                                                                               125                                                                               40  --   60   75   75   75  80  --  75  10  20                           246                                                                               62.5                                                                              70  --   90   85   90   85  85  --  88  88  88                           247                                                                               62.5                                                                              70  --   90   85   80   90  85  --  88  80  88                           248                                                                               125                                                                               70  --   70   80   80   85  88  --  85  90  90                           249                                                                               125                                                                               70  --   90   80   65   90  80  --  85  75  90                           250                                                                               31.3                                                                              88  100  100  93   95   70  88  90  78  83  99                           251                                                                               62.5                                                                              95  100  100  95   98   80  98  98  75  78  98                           252                                                                               7.8                                                                               95  95   95   95   95   78  85  25  25  35  75                           253                                                                               62.5                                                                              80  95   95   85   78   85  80  60  80  78  80                           254                                                                               31.3                                                                              95  90   100  90   75   80  80  80  90  75  85                           255                                                                               31.3                                                                              95  95   90   85   95   78  85  50  70  78  85                           256                                                                               125                                                                               85  90   90   70   75   90  75  65  55  78  65                           257                                                                               31.3                                                                              90  95   90   80   70   85  78  80  90  95  78                           258                                                                               97.5                                                                              35  95   95   75   83   83  85  90  60  70  78                           __________________________________________________________________________

70. Evaluation of Preemergence Herbicidal Activity

Seeds of the desired test plant species were planted in a soil matrix prepared by mixing a loam soil which was composed of about 43 percent silt, 19 percent clay, and 38 percent sand and had a pH of about 8.1 and an organic matter content of about 1.5 percent and sand in a 70 to 30 ratio. The soil matrix was contained in plastic pots with a surface area of 161 square centimeters. When required to ensure good germination and healthy plants, a fungicide treatment and/or other chemical or physical treatment was applied.

A weighed amount, determined by the highest rate to be tested, of each test compound was placed in a 20 mL glass vial and was dissolved in 8 mL of a 97:3 v/v (volume/volume) mixture of acetone and dimethyl sulfoxide to obtain concentrated stock solutions. If the test compound did not dissolve readily, the mixture was warmed and/or sonicated. The stock solutions obtained were diluted with a 99.9:0.1 mixture of water and Tween® 155 surfactant to obtain application solutions of known concentration. The solutions containing the highest concentration to be tested were prepared by diluting 4 mL aliquots of the stock solution with 8.5 mL of the mixture and lower concentrations were prepared by dilution of appropriate smaller portions of the stock solution. A 2.5 mL aliquot of each solution of known concentration was sprayed evenly onto the soil of each seeded pot using a Cornwall 5.0 mL glass syringe fitted with a TeeJet TN-3 hollow cone nozzle to obtain thorough coverage of the soil in each pot. Control pots were sprayed in the same manner with the aqueous mixture. A highest application rate of 4.48 Kg/Ha is achieved when 50 mg of test compound is employed.

The treated pots and control pots were placed in a greenhouse with an approximately 15 hr photoperiod which was maintained at about 23°-29° C. during the day and 22°-28° C. during the night. Nutrients and water were added on a regular basis and supplemental lighting was provided with overhead metal halide ! 000 Watt lamps as necessary. The water was added by top-irrigation. After 3 weeks the condition of the test plants that germinated and grew as compared with that of the untreated plants that germinated and grew was determined visually and scored on a scale of 0 to 100 percent where 0 corresponds to no injury and 100 corresponds to complete kill or no germination. Some of the compounds tested, application rates employed, plant species tested, and results are given in Table 3.

                                      TABLE 3                                      __________________________________________________________________________     PREEMERGENCE HERBICIDAL ACTIVITY                                                                     Wild    Barn-                                                                              Giant                                        Cpd.                                                                              Rate,                                                                              Morning-  Velvet-                                                                             Buck-                                                                              Black-                                                                             yard                                                                               fox-                                                                               Johnson-                                                                            Wild                                No.                                                                               Kg/Ha                                                                              glory                                                                               Pigweed                                                                             leaf wheat                                                                              grass                                                                              Grass                                                                              tail                                                                               grass                                                                               oats                                __________________________________________________________________________     1  0.56                                                                               85   95   90   90  40  50  40  70   40                                  2  0.28                                                                               80   99   95   95  40  20  70  70   30                                  3  0.56                                                                               40   100  90   --  0   --  30  0    50                                  4  0.28                                                                               80   100  95   75  75  80  75  65   60                                  5  0.14                                                                               80   90   95   40  70  60  60  75   30                                  6  0.56                                                                               60   0    65   10  40  80  0   30   30                                  7  1.12                                                                               80   100  90   50  95  98  60  80   0                                   8  0.018                                                                              75   98   80   80  100 100 80  90   80                                  9  0.035                                                                              80   98   80   85  100 98  70  80   60                                  10 0.28                                                                               90   95   60   50  98  90  75  80   55                                  11 0.14                                                                               90   85   75   50  95  98  50  40   0                                   12 0.14                                                                               80   100  85   60  90  80  65  50   50                                  13 0.035                                                                              60   100  85   85  100 98  95  80   75                                  14 0.28                                                                               85   98   85   60  95  98  55  60   45                                  16 0.28                                                                               70   80   70   --  70  80  60  40   70                                  17 0.28                                                                               90   100  75   --  70  70  50  40   50                                  18 0.28                                                                               80   95   60   --  50  50  80  40   75                                  19 0.14                                                                               95   98   95   98  85  95  97  98   88                                  20 0.070                                                                              95   95   90   92  60  80  75  85   70                                  21 0.14                                                                               90   98   85   95  85  75  75  70   75                                  22 2.24                                                                               85   95   85   60  60  65  70  65   10                                  23 0.070                                                                              90   98   95   92  85  90  92  99   90                                  24 0.070                                                                              90   95   90   92  70  78  80  90   50                                  25 0.035                                                                              90   98   80   50  70  95  40  60   50                                  26 0.56                                                                               90   100  85   60  50  65  40  70   20                                  27 0.28                                                                               60   100  85   50  98  70  60  30   0                                   28 0.018                                                                              50   90   75   85  90  90  50  75   20                                  29 1.12                                                                               60   98   60   70  90  100 75  85   50                                  30 0.035                                                                              90   100  65   95  90  98  90  85   40                                  31 0.14                                                                               90   100  90   100 40  90  70  90   20                                  32 0.070                                                                              85   100  85   90  98  98  90  98   40                                  33 0.035                                                                              50   100  25   100 70  98  90  85   20                                  34 0.070                                                                              90   100  90   90  98  95  40  85   50                                  35 0.070                                                                              90   100  80   90  15  10  20  10   0                                   36 0.070                                                                              60   98   70   85  60  85  60  80   60                                  37 0.035                                                                              95   100  75   100 20  65  60  0    0                                   38 0.070                                                                              85   100  60   100 0   50  20  0    10                                  39 0.070                                                                              70   100  30   90  80  95  85  90   60                                  40 0.035                                                                              40   99   65   95  95  90  40  80   20                                  41 0.070                                                                              90   100  60   100 20  99  80  85   10                                  42 0.070                                                                              90   100  90   90  98  80  70  80   50                                  43 0.070                                                                              50   98   60   85  30  60  60  20   0                                   44 0.070                                                                              90   100  60   90  98  95  98  90   60                                  45 0.070                                                                              85   100  80   90  100 95  60  85   20                                  46 0.56                                                                               50   100  50   60  80  60  50  60   0                                   47 0.070                                                                              80   0    60   90  99  85  90  85   50                                  48 0.035                                                                              98   100  90   100 20  20  30  0    20                                  49 0.035                                                                              80   100  40   99  0   0   50  10   0                                   50 0.070                                                                              90   100  90   40  98  98  80  90   80                                  51 0.035                                                                              60   98   100  90  60  95  60  80   50                                  52 0.56                                                                               85   98   65   80  40  50  40  50   20                                  53 0.035                                                                              10   90   90   95  98  80  90  80   80                                  54 0.56                                                                               90   100  90   80  60  40  30  20   20                                  55 0.56                                                                               90   90   90   88  90  87  70  90   78                                  56 0.28                                                                               90   90   85   90  85  85  80  85   75                                  57 0.14                                                                               90   88   90   90  80  90  80  85   65                                  58 0.018                                                                              90   98   85   85  90  65  40  75   40                                  59 0.035                                                                              80   95   88   90  95  70  50  80   50                                  60 0.070                                                                              85   98   80   95  90  70  60  85   50                                  61 0.035                                                                              90   98   80   85  90  80  80  90   65                                  62 0.14                                                                               90   100  95   90  100 85  78  80   50                                  63 0.070                                                                              95   90   80   80  60  70  70  --   60                                  64 1.12                                                                               55   45   0    0   0   0   0   90   0                                   65 2.24                                                                               75   80   55   45  20  45  45  10   25                                  66 0.070                                                                              90   98   95   98  98  85  80  98   90                                  67 0.035                                                                              85   90   88   90  70  60  75  75   50                                  68 0.15                                                                               85   95   92   50  40  60  60  75   20                                  69 0.070                                                                              95   95   90   95  80  85  90  100  88                                  70 0.28                                                                               90   90   85   90  85  75  70  75   50                                  71 0.070                                                                              90   60   80   92  70  65  50  95   25                                  72 0.14                                                                               90   90   85   90  95  75  70  88   65                                  73 0.070                                                                              90   85   80   88  90  80  75  85   40                                  74 0.56                                                                               80   100  90   80  80  98  80  60   50                                  75 0.56                                                                               80   98   80   80  20  50  30  40   0                                   76 0.28                                                                               75   100  70   60  50  95  60  60   50                                  77 0.56                                                                               80   100  70   60  50  30  30  40   20                                  78 0.28                                                                               90   100  85   40  65  98  60  --   0                                   79 0.28                                                                               85   100  60   40  80  95  50  --   50                                  80 0.018                                                                              95   95   80   60  90  60  80  --   0                                   81 0.009                                                                              30   98   30   80  85  95  85  --   0                                      0.070                                                                              100  100  98   95  90  100 95  --   90                                  82 0.035                                                                              80   100  80   95  98  90  90  80   60                                  83 0.035                                                                              30   98   60   85  90  90  60  80   65                                  84 0.070                                                                              85   100  75   85  100 98  50  50   70                                  85 0.070                                                                              75   100  50   80  80  90  75  98   70                                  86 0.28                                                                               100  100  70   90  98  98  90  90   75                                  87 0.56                                                                               85   100  85   40  100 98  75  85   50                                  88 0.070                                                                              90   95   85   90  75  85  78  98   80                                  89 0.28                                                                               90   90   80   20  60  90  85  --   30                                  90 0.28                                                                               80   85   90   70  98  95  90  90   85                                  91 0.14                                                                               95   90   90   75  90  95  80  --   80                                  92 0.28                                                                               95   95   90   40  95  90  90  --   70                                  93 1.12                                                                               80   50   50   40  0   50  0   30   20                                  94 1.12                                                                               90   80   80   90  99  90  90  95   90                                  95 1.12                                                                               90   90   80   80  25  65  60  30   10                                  96 0.14                                                                               90   98   95   95  88  70  60  65   65                                  97 0.035                                                                              85   90   90   95  80  70  80  90   65                                  98 0.009                                                                              85   95   80   85  85  45  60  90   20                                     0.070                                                                              90   98   85   98  95  95  98  98   85                                  99 0.14                                                                               90   90   70   80  70  65  85  70   50                                  100                                                                               0.56                                                                               70   75   80   100 80  60  70  70   40                                  101                                                                               0.070                                                                              85   98   80   90  80  90  80  95   80                                  103                                                                               0.035                                                                              90   95   80   95  80  98  85  98   70                                  104                                                                               0.035                                                                              90   90   80   90  98  98  80  98   75                                  105                                                                               0.070                                                                              60   70   40   30  50  50  50  75   10                                  106                                                                               0.070                                                                              90   95   60   95  100 95  95  95   75                                  107                                                                               0.070                                                                              40   80   20   60  0   0   20  0    0                                   108                                                                               0.018                                                                              90   98   85   95  98  90  80  98   50                                  109                                                                               0.28                                                                               90   98   80   90  95  75  45  90   50                                  110                                                                               0.14                                                                               90   95   75   85  95  85  80  95   85                                  111                                                                               0.070                                                                              85   90   90   95  90  95  90  90   85                                  112                                                                               1.12                                                                               60   100  85   30  30  40  50  60   30                                  113                                                                               1.12                                                                               80   100  90   60  30  80  30  70   0                                   114                                                                               1.12                                                                               30   80   50   30  0   20  20  0    0                                   115                                                                               0.070                                                                              90   95   95   80  95  85  70  100  70                                  116                                                                               0.009                                                                              80   90   90   60  60  40  50  80   60                                  117                                                                               0.035                                                                              80   100  85   100 99  90  90  90   90                                  118                                                                               0.56                                                                               80   90   50   70  95  50  80  90   60                                  121                                                                               0.56                                                                               85   95   80   90  95  60  90  90   80                                  122                                                                               0.14                                                                               85   95   90   95  30  95  90  90   50                                  123                                                                               0.070                                                                              80   99   80   90  70  90  90  90   85                                  125                                                                               1.12                                                                               90   70   50   30  85  90  95  95   80                                  126                                                                               0.28                                                                               95   85   98   90  95  85  70  95   90                                  127                                                                               0.28                                                                               50   75   80   70  25  10  0   85   80                                  128                                                                               0.14                                                                               90   85   80   60  95  75  20  85   90                                  129                                                                               0.018                                                                              98   70   90   85  98  80  80  80   90                                  130                                                                               0.070                                                                              90   95   88   --  98  85  85  --   85                                  131                                                                               0.56                                                                               90   95   85   --  60  65  65  --   35                                  132                                                                               0.035                                                                              90   95   95   --  --  95  75  --   60                                  133                                                                               0.14                                                                               90   100  90   --  95  80  75  --   70                                  134                                                                               0.035                                                                              90   85   80   --  65  90  60  --   70                                  135                                                                               0.018                                                                              95   90   95   --  99  98  95  --   85                                  136                                                                               0.14                                                                               80   95   80   --  90  90  50  --   40                                  138                                                                               0.035                                                                              85   95   80   --  98  90  90  --   80                                  139                                                                               0.018                                                                              90   90   80   --  90  85  80  --   90                                  140                                                                               0.070                                                                              85   95   95   --  70  90  70  --   95                                  145                                                                               0.14                                                                               90   70   70   --  50  50  50  --   30                                  146                                                                               0.14                                                                               90   90   80   --  60  60  50  --   60                                  147                                                                               0.14                                                                               70   90   85   --  80  50  95  --   85                                  148                                                                               0.14                                                                               85   80   98   --  90  95  90  --   90                                  151                                                                               0.14                                                                               90   90   80   --  80  95  80  --   50                                  152                                                                               0.14                                                                               0    30   40   --  80  30  0   --   0                                   153                                                                               0.070                                                                              90   85   90   --  40  60  60  --   20                                  154                                                                               0.035                                                                              90   90   50   --  90  70  80  --   80                                  155                                                                               0.035                                                                              90   90   80   --  90  85  70  --   90                                  156                                                                               0.070                                                                              40   60   0    --  40  60  80  --   80                                  157                                                                               0.035                                                                              90   70   80   --  75  70  50  --   70                                  158                                                                               0.070                                                                              90   99   90   --  70  75  70  --   60                                  159                                                                               0.56                                                                               85   95   90   --  95  90  95  --   90                                  160                                                                               0.035                                                                              80   90   95   --  99  40  85  --   85                                  161                                                                               0.14                                                                               85   70   90   --  98  90  90  --   80                                  162                                                                               0.14                                                                               90   95   90   --  40  60  60  --   40                                  163                                                                               0.28                                                                               90   85   85   --  70  50  30  --   60                                  164                                                                               0.56                                                                               80   80   80   --  50  40  30  --   50                                  165                                                                               0.035                                                                              95   90   95   --  85  90  95  --   75                                  166                                                                               0.035                                                                              75   90   60   --  90  85  80  --   85                                  167                                                                               0.14                                                                               90   80   90   --  60  85  80  --   50                                  168                                                                               0.035                                                                              90   95   90   --  99  98  95  --   95                                  169                                                                               0.018                                                                              90   90   90   --  70  85  70  --   70                                  170                                                                               0.035                                                                              80   98   90   --  98  70  90  --   95                                  171                                                                               0.018                                                                              80   90   90   --  90  30  65  --   75                                  172                                                                               0.14                                                                               75   98   80   --  75  85  75  --   80                                  173                                                                               0.28                                                                               75   80   80   --  70  40  50  --   75                                  175                                                                               0.070                                                                              85   98   85   --  95  95  95  --   85                                  176                                                                               0.070                                                                              90   98   95   --  85  90  70  --   70                                  177                                                                               0.56                                                                               75   100  85   --  80  70  50  --   65                                  178                                                                               0.035                                                                              85   70   85   --  85  90  70  --   80                                  179                                                                               0.28                                                                               80   90   85   --  75  70  70  --   70                                  180                                                                               0.28                                                                               85   80   80   --  85  50  --  --   75                                  181                                                                               0.070                                                                              80   95   75   --  75  90  70  --   75                                  182                                                                               0.14                                                                               80   85   95   --  70  40  75  --   60                                  183                                                                               0.28                                                                               85   90   95   --  75  30  50  --   50                                  186                                                                               0.070                                                                              90   90   95   --  98  75  75  --   90                                  187                                                                               0.070                                                                              90   85   90   --  95  80  85  --   85                                  188                                                                               0.14                                                                               70   80   30   --  65  85  95  --   75                                  189                                                                               0.14                                                                               85   95   80   --  75  85  75  --   60                                  190                                                                               0.070                                                                              90   85   98   --  85  80  70  --   50                                  191                                                                               0.018                                                                              85   80   90   --  75  98  70  --   70                                  192                                                                               0.14                                                                               80   90   80   --  85  95  95  --   85                                  193                                                                               0.14                                                                               90   90   75   --  85  95  85  --   80                                  194                                                                               0.035                                                                              80   95   85   --  90  90  95  --   80                                  195                                                                               0.28                                                                               70   80   50   --  80  78  60  --   85                                  198                                                                               0.070                                                                              85   98   95   --  85  85  80  --   80                                  199                                                                               0.070                                                                              85   95   95   --  80  90  35  --   80                                  200                                                                               0.070                                                                              85   95   75   --  90  95  85  --   85                                  201                                                                               0035                                                                               90   95   90   --  80  98  78  --   75                                  202                                                                               0.070                                                                              80   98   70   --  80  90  80  --   78                                  203                                                                               0.14                                                                               75   98   75   --  99  98  98  --   80                                  204                                                                               0.56                                                                               90   90   85   --  85  80  75  --   60                                  205                                                                               0.070                                                                              95   98   90   --  95  85  95  --   85                                  208                                                                               0.28                                                                               88   95   90   --  95  75  90  --   90                                  213                                                                               0.035                                                                              85   80   90   --  80  60  50  --   70                                  214                                                                               0.14                                                                               85   95   95   --  100 95  95  --   100                                 215                                                                               0.070                                                                              70   50   85   --  100 90  45  --   90                                  216                                                                               0.070                                                                              75   85   95   --  100 100 60  --   80                                  217                                                                               0.035                                                                              70   75   60   --  90  95  70  --   75                                  218                                                                               0.28                                                                               90   100  100  --  -90 78  60  --   90                                  219                                                                               0.28                                                                               90   70   95   --  100 100 60  --   98                                  220                                                                               0.56                                                                               30   60   75   --  75  25  65  --   90                                  221                                                                               0.28                                                                               40   90   75   --  100 75  95  --   85                                  223                                                                               0.28                                                                               80   95   95   --  --  73  95  --   80                                  224                                                                               0.28                                                                               50   60   75   --  --  0   40  --   40                                  225                                                                               0.28                                                                               80   80   90   --  --  70  78  --   90                                  226                                                                               0.070                                                                              80   95   90   --  --  98  95  --   95                                  227                                                                               0.035                                                                              70   80   78   --  --  85  90  --   90                                  228                                                                               0.14                                                                               80   90   80   --  --  95  90  --   80                                  229                                                                               0.56                                                                               80   85   80   --  --  95  85  --   80                                  230                                                                               0.28                                                                               90   100  95   --  --  70  70  --   90                                  231                                                                               0.14                                                                               85   90   90   --  --  75  70  --   90                                  232                                                                               0.14                                                                               90   90   90   --  --  95  80  --   90                                  233                                                                               0.035                                                                              70   98   80   --  90  85  90  --   80                                  234                                                                               0.14                                                                               90   95   90   --  90  95  95  --   95                                  235                                                                               0.14                                                                               90   98   95   --  90  90  90  --   85                                  236                                                                               0.14                                                                               90   80   85   --  100 90  90  --   85                                  238                                                                               0.28                                                                               85   95   85   '   90  90  80  --   85                                  239                                                                               0.14                                                                               80   95   90   --  90  90  95  --   80                                  240                                                                               0.070                                                                              85   95   80   --  95  90  80  --   80                                  241                                                                               0.28                                                                               90   90   95   --  --  78  70  --   80                                  242                                                                               0.14                                                                               95   100  90   --  --  80  75  --   100                                 243                                                                               0.070                                                                              90   98   80   --  100 100 95  --   90                                  244                                                                               0.14                                                                               90   95   80   --  90  90  95  --   90                                  245                                                                               0.28                                                                               85   85   80   --  --  90  70  --   70                                  246                                                                               0.070                                                                              90   95   78   --  --  80  90  --   85                                  247                                                                               0.28                                                                               85   100  85   --  --  95  95  --   95                                  248                                                                               0.28                                                                               75   98   75   --  --  90  90  --   90                                  249                                                                               0.56                                                                               80   98   70   --  --  90  95  --   90                                  250                                                                               0.070                                                                              80   95   90   --  85  95  90  --   80                                  251                                                                               0.070                                                                              78   95   90   --  80  95  78  --   80                                  __________________________________________________________________________ 

What is claimed is:
 1. An N-aryl[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide compound of the formula: ##STR13## wherein W, X, Y, and Z each independently represents H, CH₃, CH₂ CH₃, CH₂ OCH₃, CF₃, F, Cl, Br, I, OCH₂ CF₃, S(C₁ -C₃)alkyl, or O(C₁ -C₃)alkyl optionally monosubstituted with F, Cl, or OCH₃, with the proviso that at least one of W, X, Y, and Z represents H;V represents H, COR', CO₂ R", or CONR'"₂ ; Ar represents an aromatic moiety one of the formulas: ##STR14## A represents F, Cl, Br, CO₂ R", CONR'"₂, (C₁ -C₂)haloalkyl, NO₂, CN, SOR', or SO₂ R'; B represents H, CH₃, C₂ H₅, F, Cl, Br, CN, OR', SR', NR'"₂, phenyl, or phenoxy, each phenyl and phenoxy optionally possessing 1 to 3 substituents selected from the group consisting of F, Cl, Br, CN, CF₃, NO₂, and CH₃ ; D and J each independently represents H or CH₃ with the proviso that at least one of D and J represents H; A' and B' each independently represents H, R', OR', OCH₂ CH₂ Cl, OCH₂ CH₂ OCH₃, S(O)_(n) R', F, Cl, Br, I, CN, NO₂, C₆ H₅, CO₂ R", or CONR'"₂ with the proviso that not more than one of A' and B' represents H; D' represents H, F, Cl, Br, I, CF₃, or CH₃ ; A" represents F, Cl, Br, I, CF₃, SCF₃, CN, CO₂ R", or CONR'"₂ and is located in the 4-position when the point of attachment is the 3- or 5-position and represents F, Cl, Br, I, CF₃, or CH₃ and is located in the 3- or 5-position when the point of attachment is the 4-position; B" represents H when the point of attachment is the 3-or 5-position and represents H, Cl, Br, F, CH₃, or OCH₃ and is located the 3- or 5-position not occupied by A" when the point of attachment is the 4-position; T represents H or F; n represents 0, 1, or 2; R' represents (C₁ -C₄)alkyl optionally singly to completely substituted with fluorine; R" represents (C₁ -C₄)alkyl, (C₃ -C₄)alkenyl, or (C₃ -C₄)alkynyl; R'" represents H or (C₁ -C₄)alkyl; andwhen V represents H, the agriculturally acceptable salts thereof.
 2. A compound according to claim 1 wherein V represents H or an agriculturally acceptable salt thereof.
 3. A compound according to claim 1 wherein two of W, X, Y, and Z represent H.
 4. A compound according to claim 1 wherein one or both of W and Z represents OCH₃ or wherein W represents OCH₂ CH₃ or OC₃ H₇ (i).
 5. A compound according to claim 4 wherein W represents methoxy, ethoxy, or isopropoxy, X and Z each represent hydrogen, and Y represents methyl or a halogen; or wherein W represents methoxy or ethoxy, X and Y each represent hydrogen, and Z represents methyl, methoxy, or a halogen; or wherein Z represents methoxy or ethoxy, W and Y each represent hydrogen, and X represents methyl, trifluoromethyl, or a halogen.
 6. A compound according to claim 1 wherein Ar represents: ##STR15## wherein A represents F, Cl, Br, CO₂ R", CONR'"₂, (C₁ -C₂)haloalkyl, NO₂, CN, SOR', or SO₂ R';B represents H, CH₃, C₂ H₅, F, Cl, Br, CN, OR', SR', NR'"₂, phenyl, or phenoxy, each phenyl and phenoxy optionally possessing 1 to 3 substituents selected from the group consisting of F, Cl, Br, CN, CF₃, NO₂, and CH₃ ; and D and J each independently represents H or CH₃ with the proviso that at least one of D and J represents H.
 7. A compound according to claim 6 wherein A represents F, Cl, Br, CF₃, NO₂, or CO₂ CH₃ ; B represents F, Cl, Br, OCH₃, or CH₃, and J represents H; and D represents H or CH₃.
 8. A compound according to claim 1 wherein Ar represents: ##STR16## wherein A' and B' each independently represents H, R', OR', OCH₂ CH₂ Cl, OCH₂ CH₂ OCH₃, S(O)_(n) R', F, Cl, Br, I, CN, NO₂, C₆ H₅, CO₂ R", or CONR'"₂ with the proviso that not more than one of A' and B' represents H;D' represents H, F, Cl, Br, I, CF₃, or CH₃ ; and n represents 0, 1, or
 2. 9. A compound according to claim 8 wherein A' represents CH₃, O(C₁ -C₃)alkyl, F, Cl, Br, or I; B' represents F, Cl, Br, I, CH₃, C₂ H₅, CF₃, O(C₁ -C₃)alkyl, OCH(CH₃)CF₃, OCH₂ CH₂ F, OCH₂ CHF₂, or CO₂ (C₁ -C₃)alkyl; and D' represents H.
 10. A compound according to claim 9 wherein A' represents Br, Cl, F, or OCH₃, B' represents CH₃, OCH₃, OC₂ H₅, OC₃ H₇ (n), OC₃ H₇ (i), OCH(CH₃)CF₃, or OCH₂ CH₂ F, and D' represents H; or wherein A' represents OCH₃ or OC₂ H₅, B' represents CO₂ (C₁ -C₂)alkyl, Br, Cl, or F, and D' represents H.
 11. A compound according to claim 1 wherein Ar represents: ##STR17## wherein A" represents F, Cl, Br, I, CF₃, SCF₃, CN, CO₂ R", or CONR'"₂ and is located in the 4-position when the point of attachment is the 3- or 5-position and represents F, Cl, Br, I, CF₃, or CH₃ and is located in the 3- or 5-position when the point of attachment is the 4-position; andB" represents H when the point of attachment is the 3- or 5-position and represents H, Cl, Br, F, CH₃, or OCH₃ and is located the 3- or 5-position not occupied by A" when the point of attachment is the 4-position.
 12. A compound according to claim 11 wherein A" represents Cl, Br, I, or CF₃ and B" represents H.
 13. A compound according to claim 1 wherein Ar represents: ##STR18## wherein T represents H or F.
 14. A compound according to claim 13 wherein T represents 4-F.
 15. A compound according to claim 1 which is N-(4-bromo-1-methyl-3-pyrazolyl)-8-methoxy[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide.
 16. A compound according to claim 1 which is N-(2,6-dichlorophenyl)-6-bromo-8-methoxy[1,2,4]triazolo1,5-a]pyridine-2-sulfonamide.
 17. A compound according to claim 1 which is N-(2,6-difluorophenyl)-8-chloro-5-methoxy[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide.
 18. A compound according to claim 1 which is N-(2-fluoro-4-methyl-3-pyridinyl)-7-chloro-5-methoxy[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide.
 19. A compound according to claim 1 which is N-(2-chloro-4-methyl-3-pyridinyl)-5-methoxy-7-methyl1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide.
 20. An herbicidal composition comprising an agriculturally acceptable adjuvant or carrier and an herbicidally effective amount of an N-aryl[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide compound of the formula: ##STR19## wherein W, X, Y, and Z each independently represents H, CH₃, CH₂ CH₃, CH₂ OCH₃, CF₃, F, Cl, Br, I, OCH₂ CF₃, S(C₁ -C₃)alkyl, or O(C₁ -C₃)alkyl optionally monosubstituted with F, Cl, or OCH₃ with the proviso that at least one of W, X, Y, and Z represents H;V represents H, COR', CO₂ R", or CONR'"₂ ; Ar represents an aromatic moiety one of the formulas: ##STR20## A represents F, Cl, Br, CO₂ R", CONR'"₂, (C₁ -C₂)haloalkyl, NO₂, CN, SOR', or SO₂ R'; B represents H, CH₃, C₂ H₅, F, Cl, Br, CN, OR', SR', NR'"₂, phenyl, or phenoxy, each phenyl and phenoxy optionally possessing 1 to 3 substituents selected from the group consisting of F, Cl, Br, CN, CF₃, NO₂, and CH₃ ; D and J each independently represents H or CH₃ with the proviso that at least one of D and J represents H; A' and B' each independently represents H, R', OR', OCH₂ CH₂ Cl, OCH₂ CH₂ OCH₃, S(O)_(n) R', F, Cl, Br, I, CN, NO₂, C₆ H₅, CO₂ R", or CONR'"₂ with the proviso that not more than one of A' and B' represents H; D' represents H, F, Cl, Br, I, CF₃, or CH₃ ; A" represents F, Cl, Br, I, CF₃, SCF₃, CN, CO₂ R", or CONR'"₂ and is located in the 4-position when the point of attachment is the 3- or 5-position and represents F, Cl, Br, I, CF₃, or CH₃ and is located in the 3- or 5-position when the point of attachment is the 4-position; B" represents H when the point of attachment is the 3- or 5-position and represents H, Cl, Br, F, CH₃, or OCH₃ and is located the 3- or 5-position not occupied by A" when the point of attachment is the 4-position; T represents H or F; n represents 0, 1, or 2; R' represents (C₁ -C₄)alkyl optionally singly to completely substituted with fluorine; R" represents (C₁ -C₄)alkyl, (C₃ -C₄)alkenyl, or (C₃ -C₄)alkynyl; R'" represents H or (C₁ -C₄)alkyl; and when V represents H, the agriculturally acceptable salts thereof.
 21. A composition according to claim 20 wherein V represents H or an agriculturally acceptable salt thereof.
 22. A composition according to claim 20 wherein two of W, X, Y, and Z represent H.
 23. A composition according to claim 20 wherein one or both of W and Z represents OCH₃ or wherein W represents OCH₂ CH₃ or OC₃ H₇ (i).
 24. A composition according to claim 23 wherein W represents methoxy, ethoxy, or isopropoxy, X and Z each represent hydrogen, and Y represents methyl or a halogen; or wherein W represents methoxy or ethoxy, X and Y each represent hydrogen, and Z represents methyl, methoxy, or a halogen; or wherein Z represents methoxy or ethoxy, W and Y each represent hydrogen, and X represents methyl, trifluoromethyl, or a halogen.
 25. A composition according to claim 20 wherein Ar represents: ##STR21## wherein A represents F, Cl, Br, CO₂ R", CONR'"₂, (C₁ -C₂)haloalkyl, NO₂, CN, SOR', or SO₂ R';B represents H, CH₃, C₂ H₅, F, Cl, Br, CN, OR', SR', NR'"₂, phenyl, or phenoxy, each phenyl and phenoxy optionally possessing 1 to 3 substituents selected from the group consisting of F, Cl, Br, CN, CF₃, NO₂, and CH₃ ; and D and J each independently represents H or CH₃ with the proviso that at least one of D and J represents H.
 26. A composition according to claim 25 wherein A represents F, Cl, Br, CF₃, NO₂, or CO₂ CH₃ ; B represents F, Cl, Br, OCH₃, or CH₃, and J represents H; and D represents H or CH₃.
 27. A composition according to claim 20 wherein Ar represents: ##STR22## wherein A' and B' each independently represents H, R', OR', OCH₂ CH₂ Cl, OCH₂ CH₂ OCH₃, S(O)_(n) R', F, Cl, Br, I, CN, NO₂, C₆ H₅, CO₂ R", or CONR'"₂ with the proviso that not more than one of A' and B' represents H;D' represents H, F, Cl, Br, I, CF₃, or CH₃ ; and n represents 0, 1, or
 2. 28. A composition according to claim 27 wherein A' represents CH₃, O(C₁ -C₃)alkyl, F, Cl, Br, or I; B' represents F, Cl, Br, I, CH₃, C₂ H₅, CF₃, O(C₁ -C₃)alkyl, OCH(CH₃)CF₃, OCH₂ CH₂ F, OCH₂ CHF₂, or CO₂ (C₁ -C₃)alkyl; and D' represents H.
 29. A composition according to claim 28 wherein A' represents Br, Cl, F, or OCH₃, B' represents CH₃, OCH₃, OC₂ H₅, OC₃ H₇ (n), OC₃ H₇ (i), OCH(CH₃)CF₃, or OCH₂ CH₂ F, and D' represents H; or wherein A' represents OCH₃ or OC₂ H₅, B' represents CO₂ (C₁ -C₂)alkyl, Br, Cl, or F, and D' represents H.
 30. A composition according to claim 20 wherein Ar represents: ##STR23## A" represents F, Cl, Br, I, CF₃, SCF₃, CN, CO₂ R", or CONR'"₂ and is located in the 4-position when the point of attachment is the 3- or 5-position and represents F, Cl, Br, I, CF₃, or CH₃ and is located in the 3- or 5-position when the point of attachment is the 4-position; andB" represents H when the point of attachment is the 3- or 5-position and represents H, Cl, Br, F, CH₃, or OCH₃ and is located the 3- or 5-position not occupied by A" when the point of attachment is the 4-position.
 31. A composition according to claim 30 wherein A" represents Cl, Br, I, or CF₃ and B" represents H.
 32. A composition according to claim 20 wherein Ar represents: ##STR24## wherein T represents H or F.
 33. A composition according to claim 32 wherein T represents 4-F.
 34. A composition according to claim 20 wherein the compound is N-(4-bromo-1-methyl-3-pyrazolyl)-8-methoxy[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide.
 35. A composition according to claim 20 wherein the compound is N-(2,6-dichlorophenyl)-6-bromo-8-methoxy[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide.
 36. A composition according to claim 20 wherein the compound is N-(2,6-difluorophenyl)-8-chloro-5-methoxy[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide.
 37. A composition according to claim 20 wherein the compound is N-(2-fluoro-4-methyl-3-pyridinyl)-7-chloro-5-methoxy[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide.
 38. A composition according to claim 20 wherein the compound is N-(2-chloro-4-methyl-3-pyridinyl)-5-methoxy-7-methyl[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide.
 39. A method of controlling undesirable vegetation which comprises applying to said vegetation or to the locus thereof an herbicidally effective amount of an N-aryl[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide compound of the formula: ##STR25## wherein W, X, Y, and Z each independently represents H, CH₃, CH₂ CH₃, CH₂ OCH₃, CF₃, F, Cl, Br, I, OCH₂ CF₃, S(C₁ -C₃)alkyl, or O(C₁ -C₃)alkyl optionally monosubstituted with F, Cl, or OCH₃ with the proviso that at least one of W, X, Y, and Z represents H;V represents H, COR', CO₂ R", or CONR'"₂ ; Ar represents an aromatic moiety one of the formulas: ##STR26## A represents F, Cl, Br, CO₂ R", CONR'"₂, (C₁ -C₂)haloalkyl, NO₂, CN, SOR', or SO₂ R'; B represents H, CH₃, C₂ H₅, F, Cl, Br, CN, OR', SR', NR'"₂, phenyl, or phenoxy, each phenyl and phenoxy optionally possessing 1 to 3 substituents selected from the group consisting of F, Cl, Br, CN, CF₃, NO₂, and CH₃ ; D and J each independently represents H or CH₃ with the proviso that at least one of D and J represents H; A' and B' each independently represents H, R', OR', OCH₂ CH₂ Cl, OCH₂ CH₂ OCH₃, S(O)_(n) R', F, Cl, Br, I, CN, NO₂, C₆ H₅, CO₂ R", or CONR'"₂ with the proviso that not more than one of A' and B' represents H; D' represents H, F, Cl, Br, I, CF₃, or CH₃ ; A" represents F, Cl, Br, I, CF₃, SCF₃, CN, CO₂ R", or CONR'"₂ and is located in the 4-position when the point of attachment is the 3- or 5-position and represents F, Cl, Br, I, CF₃, or CH₃ and is located in the 3- or 5-position when the point of attachment is the 4-position; B" represents H when the point of attachment is the 3- or 5-position and represents H, Cl, Br, F, CH₃, or OCH₃ and is located the 3- or 5-position not occupied by A" when the point of attachment is the 4-position; T represents H or F; n represents 0, 1, or 2; R' represents (C₁ -C₄)alkyl optionally singly to completely substituted with fluorine; R" represents (C₁ -C₄)alkyl, (C₃ -C₄)alkenyl, or (C₃ -C₄)alkynyl; R'" represents H or (C₁ -C₄)alkyl; andwhen V represents H, the agriculturally acceptable salts thereof.
 40. A method according to claim 39 wherein V represents H or an agriculturally acceptable salt thereof.
 41. A method according to claim 39 wherein two or three of W, X, Y, and Z represent H.
 42. A method according to claim 39 wherein one or both of W and Z represents OCH₃ or wherein w represents OCH₂ CH₃ or OC₃ H₇ (i).
 43. A method according to claim 42 wherein W represents methoxy, ethoxy, or isopropoxy, X and Z each represent hydrogen, and Y represents methyl or a halogen; or wherein W represents methoxy or ethoxy, X and Y each represent hydrogen, and Z represents methyl, methoxy, or a halogen; or wherein Z represents methoxy or ethoxy, W and Y each represent hydrogen, and X represents methyl, trifluoromethyl, or a halogen.
 44. A method according to claim 39 wherein Ar represents: ##STR27## wherein A represents F, Cl, Br, CO₂ R", CONR'"₂, (C₁ -C₂)haloalkyl, NO₂, CN, SOR', or SO₂ R';B represents H, CH₃, C₂ H₅, F, Cl, Br, CN, OR', SR', NR'"₂, phenyl, or phenoxy, each phenyl and phenoxy optionally possessing 1 to 3 substituents selected from the group consisting of F, Cl, Br, CN, CF₃, NO₂, and CH₃ ; and D and J each independently represents H or CH₃ with the proviso that at least one of D and J represents H.
 45. A method according to claim 44 wherein A represents F, Cl, Br, CF₃, NO₂, or CO₂ CH₃ ; B represents F, Cl, Br, OCH₃, or CH₃, and J represents H; and D represents H or CH₃.
 46. A method according to claim 39 wherein Ar represents: ##STR28## wherein A' and B' each independently represents H, R', OR', OCH₂ CH₂ Cl, OCH₂ CH₂ OCH₃, S(O)_(n) R', F, Cl, Br, I, CN, NO₂, C₆ H₅, CO₂ R", or CONR'"₂ with the proviso that not more than one of A' and B' represents H;D' represents H, F, Cl, Br, I, CF₃, or CH₃ ; and n represents 0, 1, or
 2. 47. A method according to claim 46 wherein A' represents CH₃, O(C₁ -C₃)alkyl, F, Cl, Br, or I; B' represents F, Cl, Br, I, CH₃, C₂ H₅, CF₃, O(C₁ -C₃)alkyl, OCH(CH₃)CF₃, OCH₂ CH₂ F, OCH₂ CHF₂, or CO₂ (C₁ -C₃)alkyl; and D' represents H.
 48. A method according to claim 47 wherein A' represents Br, Cl, F, or OCH₃, B' represents CH₃, OCH₃, OC₂ H₅, OC₃ H₇ (n), OC₃ H₇ (i), OCH(CH₃)CF₃, or OCH₂ CH₂ F, and D' represents H; or wherein A' represents OCH₃ or OC₂ H₅, B' represents CO₂ (C₁ -C₂)alkyl, Br, Cl, or F, and D' represents H.
 49. A method according to claim 39 wherein Ar represents: ##STR29## A" represents F, Cl, Br, I, CF₃, SCF₃, CN, CO₂ R", or CONR'"₂ and is located in the 4-position when the point of attachment is the 3- or 5-position and represents F, Cl, Br, I, CF₃, or CH₃ and is located in the 3- or 5-position when the point of attachment is the 4-position; andB" represents H when the point of attachment is the 3- or 5-position and represents H, Cl, Br, F, CH₃, or OCH₃ and is located the 3- or 5-position not occupied by A" when the point of attachment is the 4-position.
 50. A method according to claim 49 wherein A" represents Cl, Br, I, or CF₃ and B" represents H.
 51. A method according to claim 39 wherein Ar represents: ##STR30## wherein T represents H or F.
 52. A method according to claim 51 wherein T represents 4-F.
 53. A method according to claim 39 wherein the compound is N-(4-bromo-1-methyl-3-pyrazolyl)-8-methoxy[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide.
 54. A method according to claim 39 wherein the compound is N-(2,6-dichlorophenyl)-6-bromo-8-methoxy[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide.
 55. A method according to claim 39 wherein the compound is N-(2,6-difluorophenyl)-8-chloro-5-methoxy[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide.
 56. A method according to claim 39 wherein the compound is N-(2-fluoro-4-methyl-3-pyridinyl)-7-chloro-5-methoxy[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide.
 57. A method according to claim 39 wherein the compound is N-(2-chloro-4-methyl-3-pyridinyl)-5-methoxy-7--methyl[1,2,4]triazolo[1,5-a]pyridine-2-sulfonamide. 